CMLA Certification Exam — Questions and Answers

Question 1: Which term means pertaining to both sides?

Contralateral
Multilateral
Unilateral
Bilateral (Correct answer)

Correct answer: Bilateral

Bilateral means pertaining to both sides, with 'bi-' meaning two and 'lateral' meaning side.

Question 2: What should you do if a chemical spill reaches the floor?

Wait for the next shift to handle it.
Ignore it, it will evaporate.
Pour more chemicals to neutralize the spill.
Contain and clean it according to SDS instructions. (Correct answer)

Correct answer: Contain and clean it according to SDS instructions.

A chemical spill on the floor requires immediate action to contain its spread and clean it up according to the specific instructions in the chemical's Safety Data Sheet (SDS). This prevents slips, falls, further exposure, and potential damage to the facility. Ignoring it or attempting neutralization without proper knowledge is dangerous.

Question 3: What should be done if quality control procedures reveal an equipment malfunction?

Use the equipment for low-importance tests.
Ignore the malfunction and continue using the equipment.
Report the malfunction but keep using the equipment.
Stop using the equipment until it is repaired or recalibrated. (Correct answer)

Correct answer: Stop using the equipment until it is repaired or recalibrated.

If quality control procedures reveal an equipment malfunction, it is critical to stop using the equipment until it is repaired or recalibrated. Continuing to use faulty equipment would compromise the accuracy and reliability of patient test results. This action ensures patient safety and maintains the integrity of the laboratory's diagnostic services.

Question 4: The suffix '-emia' refers to a condition of the:

Lymph
Urine
Tissue
Blood (Correct answer)

Correct answer: Blood

The suffix '-emia' specifically denotes a condition relating to the blood, as in 'anemia' or 'hypoglycemia'.

Question 5: Why is it important to regularly inspect laboratory equipment?

To keep it clean.
To prevent accidents and ensure accuracy. (Correct answer)
To make it look good.
It is not important.

Correct answer: To prevent accidents and ensure accuracy.

Regularly inspecting laboratory equipment is important to prevent accidents and ensure the accuracy of test results. Inspections help identify wear and tear, malfunctions, or potential hazards before they lead to equipment failure or compromise sample integrity. This proactive approach maintains a safe working environment and reliable diagnostic outcomes.

Question 6: What is the PRIMARY reason for regulatory compliance in the Certified Medical Laboratory Assistant profession?

To create additional paperwork for documentation
To avoid penalties and fines only
To justify higher service fees
To protect public safety, ensure quality standards, and maintain professional integrity (Correct answer)

Correct answer: To protect public safety, ensure quality standards, and maintain professional integrity

Regulatory compliance serves the broader purpose of protecting public safety, ensuring consistent quality standards, and maintaining the integrity of the profession. While avoiding penalties is a benefit, the primary motivation is safeguarding the public interest.

Question 7: Which separation technique uses differences in solubility and partitioning between a stationary and mobile phase to separate analytes?

Electrophoresis
Centrifugation
Chromatography (Correct answer)
Spectrophotometry

Correct answer: Chromatography

Chromatography separates analytes based on their differential affinities for a stationary phase versus a mobile phase.

Question 8: What is the first priority in medical terminology for CMLA practitioners?

Following insurance requirements
Ensuring patient safety and well-being (Correct answer)
Meeting productivity targets
Completing documentation

Correct answer: Ensuring patient safety and well-being

Patient safety and well-being must always be the first priority in clinical practice, taking precedence over administrative concerns.

Question 9: Which regulation governs laboratory-developed tests and quality standards for clinical laboratories in the United States?

HIPAA
FDA 510(k) clearance
OSHA Bloodborne Pathogens Standard
CLIA (Clinical Laboratory Improvement Amendments) (Correct answer)

Correct answer: CLIA (Clinical Laboratory Improvement Amendments)

CLIA establishes quality standards for all laboratory testing performed on human specimens, covering personnel, QC, proficiency testing, and inspections.

Question 10: Which of the following best describes the difference between accuracy and precision in laboratory QC?

Both terms describe the same concept in clinical laboratories
Accuracy measures reproducibility; precision measures closeness to true value
Accuracy measures closeness to true value; precision measures reproducibility (Correct answer)
Accuracy applies to calibrators; precision applies to controls

Correct answer: Accuracy measures closeness to true value; precision measures reproducibility

Accuracy refers to how close a result is to the true value, while precision refers to how reproducible repeated measurements are.

Question 11: A disk diffusion test shows no zone of inhibition around an antibiotic disk. This indicates the organism is:

Intermediate
Susceptible
Indeterminate
Resistant (Correct answer)

Correct answer: Resistant

No zone of inhibition means the antibiotic did not inhibit bacterial growth around the disk, indicating the organism is resistant to that antibiotic.

Question 12: Which of the following pathogens requires droplet precautions?

Measles
Aspergillus species
Varicella (chickenpox)
Influenza (Correct answer)

Correct answer: Influenza

Influenza is transmitted by large respiratory droplets and therefore requires droplet precautions, including a surgical mask within 3 feet of the patient.

Question 13: A urinalysis analyzer reports 'cuvette dirty' error. What is the correct response?

Replace the entire reagent cartridge
Clean the cuvette per manufacturer protocol and run a system check (Correct answer)
Ignore the error and proceed with testing
Restart the analyzer without cleaning

Correct answer: Clean the cuvette per manufacturer protocol and run a system check

A dirty cuvette causes optical errors; cleaning per manufacturer instructions restores accurate photometric readings.

Question 14: Why is it important to know the location of emergency equipment in the laboratory?

It’s unnecessary as they are self-explanatory.
So you can impress others with your knowledge.
So you can respond quickly in emergencies. (Correct answer)
So you can avoid using them.

Correct answer: So you can respond quickly in emergencies.

Knowing the location of emergency equipment, such as eyewash stations, safety showers, and fire extinguishers, is vital for responding quickly and effectively during an emergency. Rapid access to these tools can minimize injuries and mitigate hazardous situations, potentially saving lives.

Question 15: What is the normal lifespan of a red blood cell in circulation?

60 days
120 days (Correct answer)
150 days
90 days

Correct answer: 120 days

Red blood cells have a normal lifespan of approximately 120 days before being removed by the spleen.

Question 16: What is the function of the decontamination cycle at the end of run on an automated blood cell counter?

To reset reagent volume counters
To print a final QC report
To flush the fluidic system with cleaning solution and prevent carryover or clogging (Correct answer)
To calibrate the cell counting aperture

Correct answer: To flush the fluidic system with cleaning solution and prevent carryover or clogging

The end-of-run decontamination cycle removes residual blood and reagent from the fluidics, preventing clogging and biohazard contamination between sessions.

Question 17: Which is the correct order of donning (putting on) PPE before entering a patient isolation room?

Gown → Mask/Respirator → Goggles → Gloves (Correct answer)
Goggles → Gloves → Gown → Mask
Gloves → Gown → Mask → Goggles
Mask → Gloves → Gown → Goggles

Correct answer: Gown → Mask/Respirator → Goggles → Gloves

CDC recommends donning in the order: gown, mask/respirator, goggles/face shield, then gloves last to avoid contaminating other PPE.

Question 18: When documenting assessment findings in CMLA practice, which approach is MOST appropriate?

Summarize findings verbally without written documentation
Use technical jargon that only experts can understand
Include only positive findings to maintain optimism
Record objective findings, measurements, and professional observations factually (Correct answer)

Correct answer: Record objective findings, measurements, and professional observations factually

Assessment documentation must be objective, factual, and comprehensive. Recording measurements, observations, and findings without bias ensures that the documentation is useful for decision-making and withstands scrutiny.

Question 19: What is the correct action if a laboratory worker's mucous membranes are splashed with a potentially infectious body fluid?

Apply antibiotic ointment to the affected area
Wipe with an alcohol swab and continue working
Flush with water for at least 15 minutes and report the exposure (Correct answer)
Place an ice pack on the area and monitor for symptoms

Correct answer: Flush with water for at least 15 minutes and report the exposure

Mucous membrane exposures require immediate flushing with water for a minimum of 15 minutes followed by prompt reporting and post-exposure evaluation.

Question 20: What is the primary reason for using a winged infusion set (butterfly) in pediatric or geriatric patients?

Faster blood collection than evacuated tubes
Greater control and flexibility for small or fragile veins (Correct answer)
Larger gauge for higher flow rate
Elimination of the need for an order of draw

Correct answer: Greater control and flexibility for small or fragile veins

Butterfly needles allow the phlebotomist to stabilize the needle more precisely in small or delicate veins, reducing the risk of through-puncture.

Question 21: In the laboratory chain of custody for forensic or legal specimens, which step is most critical?

Continuous documentation of specimen handling from collection to reporting (Correct answer)
Processing specimens in batches to save time
Storing specimens at room temperature
Rapid processing to avoid degradation

Correct answer: Continuous documentation of specimen handling from collection to reporting

Chain of custody requires unbroken documentation of every person who handles a specimen to maintain its integrity for legal purposes.

Question 22: How should you store a blood sample after collection?

Store it in the freezer.
Leave it exposed to air.
Refrigerate it immediately or follow specific instructions. (Correct answer)
Store it at room temperature until tested.

Correct answer: Refrigerate it immediately or follow specific instructions.

After collection, blood samples should be refrigerated immediately or stored according to specific instructions to maintain their stability. Refrigeration slows down metabolic processes and degradation of analytes, preventing changes that could affect test results. Following specific instructions ensures optimal preservation for the intended tests.

Question 23: What does the abbreviation 'SST' stand for, and what is its primary use?

Sterile Specimen Tube; used for microbiology
Sodium Sulfate Tube; used for coagulation
Slide Smear Tube; used for hematology
Serum Separator Tube; used for serum chemistry testing (Correct answer)

Correct answer: Serum Separator Tube; used for serum chemistry testing

The SST (gold or red-gray top) contains a clot activator and gel separator that separates serum from cells after centrifugation for chemistry testing.

Question 24: In CMLA science preparation, what does homeostasis refer to?

Rapid growth
Cell division
Energy production
The tendency to maintain stable internal conditions (Correct answer)

Correct answer: The tendency to maintain stable internal conditions

Homeostasis is the process by which organisms maintain stable internal conditions necessary for survival despite external changes.

Question 25: Which suffix means 'surgical removal' or 'excision'?

-ectomy (Correct answer)
-plasty
-otomy
-ostomy

Correct answer: -ectomy

The suffix '-ectomy' means surgical removal or excision, as in appendectomy (removal of the appendix).

Question 26: Which approach to medical terminology is considered best practice in current CMLA standards?

The least expensive option
One-size-fits-all protocols
Evidence-based, individualized interventions (Correct answer)
Traditional methods exclusively

Correct answer: Evidence-based, individualized interventions

Evidence-based, individualized interventions combine the best available research with patient-specific factors for optimal outcomes.

Question 27: A laboratory is implementing a new hematology analyzer. Which validation study specifically confirms the analyzer produces equivalent results to the current method?

Linearity study
Method comparison study (Correct answer)
Imprecision study
Reference interval verification

Correct answer: Method comparison study

A method comparison study tests patient samples on both analyzers simultaneously to confirm the new instrument produces clinically equivalent results.

Question 28: In the ABO blood group system, a person with type O blood has:

Both A and B antigens on RBCs
A antigens on RBCs and no antibodies
B antigens on RBCs and anti-A antibodies
No antigens on RBCs and both anti-A and anti-B antibodies (Correct answer)

Correct answer: No antigens on RBCs and both anti-A and anti-B antibodies

Type O individuals have no A or B antigens on their red cells but carry both anti-A and anti-B antibodies in their plasma.

Question 29: Which of the following is a property of water that makes it an excellent biological solvent?

It has low surface tension
It has high polarity and hydrogen bonding (Correct answer)
It is nonpolar
It is a weak electrolyte

Correct answer: It has high polarity and hydrogen bonding

Water's polar nature and hydrogen bonding ability allow it to dissolve a wide range of ionic and polar substances found in biological systems.

Question 30: How should Certified Medical Laboratory Assistant professionals handle technical procedures that have been updated or revised?

Wait for mandatory enforcement before changing
Continue using the original method if it still works
Review the updates, complete any required training, and implement the revised procedures (Correct answer)
Only apply updates to new cases or projects

Correct answer: Review the updates, complete any required training, and implement the revised procedures

When procedures are updated, professionals must review the changes, complete any required training to understand the rationale and new requirements, and implement the revised procedures in their practice. Continuing outdated methods risks non-compliance and suboptimal outcomes.

Question 31: When a new reagent lot is placed into service, the laboratory should first:

Contact the manufacturer for new control ranges
Perform parallel testing with the old and new lot before switching (Correct answer)
Run patient samples immediately to confirm performance
Dispose of all remaining old-lot reagents

Correct answer: Perform parallel testing with the old and new lot before switching

Parallel testing of old and new reagent lots ensures equivalent performance before transitioning to the new lot to protect patient safety.

Question 32: Which approach best demonstrates mastery of hematology basics in CMLA practice?

Following procedures without understanding
Avoiding complex scenarios
Relying entirely on technology
Applying principles to novel situations with sound judgment (Correct answer)

Correct answer: Applying principles to novel situations with sound judgment

True mastery involves understanding underlying principles well enough to apply them to new and unfamiliar situations with professional judgment.

Question 33: A sharp container should be replaced when it is filled to what level?

90% full
50% full
75% full (Correct answer)
100% full

Correct answer: 75% full

Sharp containers should be sealed and replaced when three-quarters (75%) full to prevent overfilling and needle-stick injuries.

Question 34: Which tube is used to collect a specimen for a prothrombin time (PT) test?

Green (heparin)
Light blue (sodium citrate) (Correct answer)
Lavender (EDTA)
Red (no additive)

Correct answer: Light blue (sodium citrate)

The light blue tube contains sodium citrate, which preserves clotting factors for coagulation studies like PT and aPTT.

Question 35: The combining form 'ureter/o' refers to the tube that connects the:

Bladder to prostate
Kidney to renal pelvis
Bladder to urethra
Kidney to bladder (Correct answer)

Correct answer: Kidney to bladder

The ureter is the tube that carries urine from the kidney down to the urinary bladder.

Question 36: Which term means pertaining to the liver?

Renal
Hepatic (Correct answer)
Cardiac
Pulmonary

Correct answer: Hepatic

Hepatic is derived from the root 'hepat-' meaning liver, as in hepatitis (inflammation of the liver).

Question 37: What does a Levy-Jennings chart primarily monitor in a clinical laboratory?

Equipment maintenance schedules
Inventory levels of reagents
Patient result turnaround times
Quality control results over time to detect trends and shifts (Correct answer)

Correct answer: Quality control results over time to detect trends and shifts

Levy-Jennings charts plot QC values over time, allowing laboratory staff to detect shifts, trends, and random errors visually.

Question 38: What does the suffix '-lysis' mean?

Inflammation
Hardening
Destruction or breakdown (Correct answer)
Formation

Correct answer: Destruction or breakdown

The suffix '-lysis' means destruction or breakdown, as in hemolysis (breakdown of red blood cells) or urinalysis (breakdown/analysis of urine components).

Question 39: Which quality control record is most important to review before using a newly repaired pipette?

Post-repair calibration verification record (Correct answer)
The last scheduled cleaning log
The daily temperature log of the storage cabinet
The original purchase invoice

Correct answer: Post-repair calibration verification record

A post-repair calibration record confirms the pipette delivers accurate volumes after servicing before it is returned to use.

Question 40: Why is proper documentation important in quality control?

It is not important.
To ensure tests are not repeated.
For accountability, tracking, and future reference. (Correct answer)
To speed up the testing process.

Correct answer: For accountability, tracking, and future reference.

Proper documentation in quality control is essential for accountability, tracking, and future reference. It provides a clear, auditable record of all QC activities, including results, corrective actions, and equipment maintenance. This documentation is vital for troubleshooting, demonstrating compliance with regulations, and supporting continuous quality improvement.

Question 41: Which prefix means 'below normal' or 'deficient'?

Tachy-
Hypo- (Correct answer)
Hyper-
Brady-

Correct answer: Hypo-

Hypo- means below normal or deficient, as in hypoglycemia (low blood sugar) or hypotension (low blood pressure).

Question 42: During a routine check, a laboratory thermometer reads 2°C higher than the NIST-traceable reference thermometer. What is the correct response?

Use the thermometer only for non-critical applications
Recalibrate the reference thermometer instead
Apply a correction factor and document it, or replace the thermometer (Correct answer)
Continue using the thermometer since 2°C is within typical room variation

Correct answer: Apply a correction factor and document it, or replace the thermometer

A documented correction factor or thermometer replacement ensures temperature-sensitive specimens and reagents are stored at the true required temperature.

Question 43: How should Certified Medical Laboratory Assistant professionals handle technical procedures that have been updated or revised?

Wait for mandatory enforcement before changing
Continue using the original method if it still works
Only apply updates to new cases or projects
Review the updates, complete any required training, and implement the revised procedures (Correct answer)

Correct answer: Review the updates, complete any required training, and implement the revised procedures

Question 44: What does the prefix 'macro-' mean?

Few
Large (Correct answer)
Many
Small

Correct answer: Large

Macro- means large, as in macrocyte (abnormally large red blood cell) or macroscopic (visible to the naked eye).

Question 45: When a control value falls outside the 2s warning limit but within the 3s rejection limit, which Westgard rule has been violated?

R-4s rejection rule
1-2s warning rule (Correct answer)
1-3s rejection rule
2-2s rejection rule

Correct answer: 1-2s warning rule

The 1-2s rule is a warning rule triggered when one control value exceeds ±2 standard deviations, signaling the need for increased scrutiny.

Question 46: A urine sample has a strong ammonia odor. What is the most likely cause?

Phenylketonuria
Maple syrup urine disease
Diabetic ketoacidosis
Bacterial decomposition (Correct answer)

Correct answer: Bacterial decomposition

Bacterial decomposition of urea produces ammonia, causing a strong ammonia odor in urine left at room temperature.

Question 47: What is the function of a rotor imbalance detector in a centrifuge?

To alert the user when the rotor needs lubrication
To count the total number of spins logged on the rotor
To shut down the centrifuge automatically if unequal loading causes dangerous vibration (Correct answer)
To measure the RPM of the rotor during operation

Correct answer: To shut down the centrifuge automatically if unequal loading causes dangerous vibration

Rotor imbalance detectors prevent mechanical damage and rotor failure by stopping the centrifuge when dangerous vibration is detected.

Question 48: A laboratory refrigerator used to store patient specimens is found to also contain an employee's lunch. This situation violates which regulation?

CLIA regulations on specimen storage temperature
FDA food safety guidelines
CAP accreditation standards on refrigerator capacity
OSHA Bloodborne Pathogen Standard prohibiting food storage where blood is present (Correct answer)

Correct answer: OSHA Bloodborne Pathogen Standard prohibiting food storage where blood is present

OSHA's Bloodborne Pathogen Standard explicitly prohibits storing food or drink in refrigerators where blood or potentially infectious materials are kept.

Question 49: What does the suffix '-phagia' mean?

Breathing
Eating or swallowing (Correct answer)
Speaking
Urinating

Correct answer: Eating or swallowing

The suffix '-phagia' means eating or swallowing, as in dysphagia (difficulty swallowing) or polyphagia (excessive eating).

Question 50: In CMLA practice, what is the best approach to quality improvement in hematology basics?

Copy what other organizations do without analysis
Wait for problems to occur before acting
Make changes without measuring results
Use data-driven methods with measurable outcomes (Correct answer)

Correct answer: Use data-driven methods with measurable outcomes

Data-driven quality improvement with measurable outcomes ensures that changes actually produce the intended improvements and can be verified.

Question 51: Which statistical measure best represents the day-to-day variability of a QC control material?

Reference range
Median
Coefficient of variation (CV) (Correct answer)
Mean

Correct answer: Coefficient of variation (CV)

The CV expresses standard deviation as a percentage of the mean, making it the best measure for comparing variability across different analytes or concentrations.

Question 52: The prefix 'brady-' means:

Normal
Slow (Correct answer)
Irregular
Fast

Correct answer: Slow

Brady- means slow, as in bradycardia (abnormally slow heart rate) or bradypnea (abnormally slow breathing rate).

Question 53: Which type of error causes all control values to shift consistently in the same direction from the mean?

Proportional error
Systematic error (Correct answer)
Random error
Gross error

Correct answer: Systematic error

Systematic error (bias) shifts results consistently in one direction, often due to reagent lot changes, calibration drift, or temperature issues.

Question 54: Urobilinogen is increased in urine in which condition?

Hemolytic anemia (Correct answer)
Diabetes insipidus
Obstructive jaundice
Renal failure

Correct answer: Hemolytic anemia

Hemolytic anemia increases bilirubin production, leading to increased urobilinogen formation and excretion in urine.

Question 55: Which of the following best describes the purpose of using 70% isopropyl alcohol rather than 100% for surface disinfection?

100% is too expensive for routine use
70% is less toxic to laboratory workers
100% alcohol leaves a residue that contaminates specimens
The water in 70% solutions allows longer contact time and better protein denaturation (Correct answer)

Correct answer: The water in 70% solutions allows longer contact time and better protein denaturation

The water component in 70% isopropyl alcohol slows evaporation and enhances protein coagulation in microbial cells, making it more effective as a disinfectant.

Question 56: The term 'antecubital' refers to the area:

Above the shoulder
Behind the knee
In front of the elbow (Correct answer)
Below the wrist

Correct answer: In front of the elbow

Antecubital means in front of the elbow; 'ante-' means before/in front of and 'cubital' refers to the elbow/forearm.

Question 57: A laboratory receives a specimen with a cracked tube and no secondary containment. The FIRST step is to:

Process the specimen immediately to avoid further delay
Contact the physician for verbal results
Don appropriate PPE before handling the package (Correct answer)
Discard the specimen and order a recollect without notification

Correct answer: Don appropriate PPE before handling the package

PPE must be donned before handling any potentially contaminated or damaged specimen to protect the worker from exposure.

Question 58: Which corrective action is most appropriate when a single control value fails the 1-3s rejection rule?

Repeat only the failed control and average the two results
Stop patient testing, investigate the cause, and repeat QC before reporting results (Correct answer)
Adjust the mean on the Levey-Jennings chart to accommodate the outlier
Continue patient testing while noting the failure in the logbook

Correct answer: Stop patient testing, investigate the cause, and repeat QC before reporting results

A 1-3s violation is a rejection rule requiring the laboratory to stop reporting, identify the root cause, resolve the issue, and confirm QC is acceptable before continuing.

Question 59: Which waste stream is used for blood-soaked materials and cultures of infectious agents?

Chemical waste container
Recycling bin
Regulated medical/biohazardous waste (red bag) (Correct answer)
Regular municipal waste

Correct answer: Regulated medical/biohazardous waste (red bag)

Blood-soaked materials and infectious cultures are regulated medical waste and must be placed in red biohazard bags for proper disposal.

Question 60: In Certified Medical Laboratory Assistant, what is the PRIMARY purpose of conducting an initial assessment?

To fulfill administrative paperwork requirements
To establish a baseline and identify needs for appropriate action (Correct answer)
To demonstrate the assessor's expertise
To generate documentation for billing purposes

Correct answer: To establish a baseline and identify needs for appropriate action

The initial assessment establishes a baseline of current conditions and identifies specific needs. This foundational information guides all subsequent decisions, planning, and interventions.

Question 61: A 24-hour urine collection is started at 7:00 AM. The patient's first morning void should be:

Included as the first specimen of the collection
Split between two collection containers
Refrigerated separately and added at the end
Discarded, and collection begins with the next void (Correct answer)

Correct answer: Discarded, and collection begins with the next void

The first morning void is discarded to establish a clean starting point; all subsequent voids for exactly 24 hours are collected.

Question 62: When establishing a new QC mean and standard deviation for a control material, the minimum number of data points typically recommended is:

3 data points from a single run
20 data points over 20 days (Correct answer)
5 data points over 2 days
10 data points over 5 days

Correct answer: 20 data points over 20 days

At least 20 data points collected over 20 days is the standard recommendation to establish a reliable mean and standard deviation for QC materials.

Question 63: What should you do if laboratory equipment shows signs of wear and tear?

Try to fix it yourself.
Ignore it and continue using it.
Use it until it breaks completely.
Report for repair or replace it. (Correct answer)

Correct answer: Report for repair or replace it.

If laboratory equipment shows signs of wear and tear, it should be reported for repair or replacement. Continuing to use compromised equipment can lead to inaccurate results, unexpected breakdowns during critical procedures, or safety risks. Prompt action ensures the reliability and safety of laboratory operations.

Question 64: The prefix 'micro-' means:

Few
Large
Many
Small (Correct answer)

Correct answer: Small

Micro- means small, as in microcyte (abnormally small red blood cell) or microscope (instrument to view small objects).

Question 65: Why is it important to use appropriately sized tubes when operating a centrifuge?

Larger tubes always spin faster
Smaller tubes require longer centrifugation times
Tube size affects only the sample volume collected
Mismatched tube sizes can cause imbalance and rotor stress, risking equipment failure (Correct answer)

Correct answer: Mismatched tube sizes can cause imbalance and rotor stress, risking equipment failure

Tubes must fit the rotor buckets properly to prevent imbalance, vibration, and potential catastrophic rotor failure.

Question 66: Which term describes a condition of abnormal cell development?

Hyperplasia
Metaplasia
Aplasia
Dysplasia (Correct answer)

Correct answer: Dysplasia

Dysplasia means abnormal development or growth, with 'dys-' meaning bad/abnormal and '-plasia' meaning formation/development.

Question 67: What is the role of informed consent in medical terminology?

It protects only the provider
It ensures the patient understands and agrees to the plan (Correct answer)
It is only needed for surgery
It is a mere formality

Correct answer: It ensures the patient understands and agrees to the plan

Informed consent ensures patients understand the proposed interventions, alternatives, risks, and benefits before agreeing to proceed.

Question 68: Which specimen requires transport in a biohazard bag with a separate compartment for the requisition form?

Only specimens requiring refrigeration
All clinical laboratory specimens (Correct answer)
Only blood cultures
Only urine specimens

Correct answer: All clinical laboratory specimens

OSHA and CLSI standards require all patient specimens to be transported in leak-proof biohazard bags with the requisition kept separate to prevent contamination.

Question 69: What documentation is MOST critical to maintain for safety compliance in the Certified Medical Laboratory Assistant field?

Incident reports, training records, and inspection logs (Correct answer)
Annual revenue reports
Client marketing preferences
Employee vacation schedules

Correct answer: Incident reports, training records, and inspection logs

Incident reports, training records, and inspection logs are essential safety documentation. They demonstrate compliance with safety regulations, track training completion, and provide evidence of systematic hazard management.

Question 70: In laboratory quality control, a Levey-Jennings chart is used to:

Schedule preventive maintenance of equipment
Track inventory of reagents over time
Document employee training completion
Monitor analytical precision and detect instrument drift visually (Correct answer)

Correct answer: Monitor analytical precision and detect instrument drift visually

Levey-Jennings charts plot QC results over time against control limits, allowing visual detection of trends, shifts, and random error.

Question 71: If a laboratory's coefficient of variation (CV) for a glucose control is 3%, what does this indicate about the method's precision?

High imprecision; the method needs recalibration
Perfect precision with no variability
Systematic bias requiring reagent replacement
Acceptable precision for most routine chemistry tests (Correct answer)

Correct answer: Acceptable precision for most routine chemistry tests

A CV of 3% for glucose is generally within acceptable limits for routine chemistry, indicating adequate but not perfect precision.

Question 72: What is the most important professional competency for CMLA certification in hematology basics?

Memorization of all reference materials
Speed of task completion
Deep knowledge combined with practical application skills (Correct answer)
Ability to work alone exclusively

Correct answer: Deep knowledge combined with practical application skills

Professional competency requires both deep knowledge of the subject matter and the ability to apply that knowledge in practical situations.

Question 73: What is the role of proficiency testing in quality control?

To meet regulatory requirements only.
To evaluate laboratory staff's ability and accuracy. (Correct answer)
To improve laboratory efficiency.
To check if equipment is functioning.

Correct answer: To evaluate laboratory staff's ability and accuracy.

Proficiency testing in quality control evaluates the laboratory staff's ability and accuracy in performing tests. It involves testing unknown samples provided by an external agency and comparing the results to those of other laboratories. This external assessment helps identify areas for improvement, ensures consistent performance, and validates the competence of the laboratory personnel.

Question 74: The suffix '-itis' denotes:

Surgical removal
Tumor
Abnormal condition
Inflammation (Correct answer)

Correct answer: Inflammation

The suffix '-itis' means inflammation, as in appendicitis (inflammation of the appendix) or arthritis (inflammation of joints).

Question 75: A pH meter reads 0.3 units higher than the buffer standard. After replacing the buffer, the error persists. What should be checked next?

The power supply voltage
The room temperature sensor
The internal clock and date settings
The condition and calibration of the pH electrode (Correct answer)

Correct answer: The condition and calibration of the pH electrode

A persistent offset after buffer replacement points to a degraded or improperly stored electrode as the most likely cause.

Question 76: How should you handle broken glassware in the laboratory?

Pick it up with your bare hands.
Leave it for someone else to clean.
Throw it in the regular trash.
Use a broom and dustpan to clean it up. (Correct answer)

Correct answer: Use a broom and dustpan to clean it up.

Broken glassware should always be handled with extreme caution to prevent cuts and injuries. Using a broom and dustpan allows you to safely collect the shards without direct hand contact. It should then be disposed of in a designated sharps container, not regular trash.

Question 77: The medical term 'leukocytosis' means:

Destruction of white blood cells
Increase in white blood cells (Correct answer)
Decrease in white blood cells
Absence of white blood cells

Correct answer: Increase in white blood cells

Leuko- means white, -cyte means cell, and -osis means abnormal increase, so leukocytosis is an abnormal increase in white blood cells.

Question 78: What does a left shift in the WBC differential indicate?

Increased immature neutrophils (bands) (Correct answer)
Increased mature lymphocytes
Decreased total WBC count
Increased eosinophils

Correct answer: Increased immature neutrophils (bands)

A left shift indicates the presence of increased band neutrophils or earlier precursors, often indicating severe bacterial infection.

Question 79: Which parameter is most critical to verify before using a new lot of control material on a chemistry analyzer?

The expiration date printed on the package
The control manufacturer's name
The color of the control material
That new lot values fall within acceptable ranges established by parallel testing (Correct answer)

Correct answer: That new lot values fall within acceptable ranges established by parallel testing

New lot controls must be validated by parallel runs with the current lot to establish mean and acceptable ranges before the old lot expires.

Question 80: What is the correct procedure for labeling chemicals in the laboratory?

Use a sticky note with a short description.
Clearly label with the chemical name and hazards. (Correct answer)
Don’t label them if the container looks clean.
Use vague labels to save time.

Correct answer: Clearly label with the chemical name and hazards.

Proper chemical labeling is critical for safety and accurate identification. Labels must clearly state the chemical name, concentration, and any associated hazards to inform users of potential risks and ensure correct handling and storage. Vague or absent labels can lead to dangerous mix-ups.

CMLA Certification Exam

The Certified Medical Laboratory Assistant (CMLA) certification validates the skills and knowledge required to perform pre-analytical and post-analytical tasks in a medical laboratory.

Questions

90 min

Time Limit

70%

To Pass

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Exam Rules

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