Question 1: When collecting a clean-catch midstream urine specimen, what is the correct sequence of steps?

• Void first portion, collect midstream, then finish voiding into toilet (Correct answer)
• Collect the first portion of urine stream into the specimen cup
• Collect the entire voiding into the specimen cup
• Collect the last portion of urine stream into the specimen cup

Correct answer: Void first portion, collect midstream, then finish voiding into toilet

A clean-catch midstream urine specimen requires the patient to void the first portion into the toilet, collect the midstream urine into the cup, and then finish voiding into the toilet. This technique minimizes contamination from skin flora around the urethral opening.

The clean-catch midstream technique is designed to collect urine with minimal contamination. The first portion of urine washes bacteria from the urethra and perineal area. The midstream portion reflects bladder urine more accurately. The patient or CNA should first clean the perineal area with antiseptic wipes, then have the patient void the initial stream (about 1-2 ounces) into the toilet, redirect the stream into the sterile cup to collect 1-2 ounces, and then finish voiding into the toilet. This specimen is commonly used to diagnose urinary tract infections.

Question 2: A patient requires a 24-hour urine collection. What should the CNA do at the START of the collection period?

• Discard the patient's first voiding, then begin collecting all subsequent voidings (Correct answer)
• Collect the patient's first voiding into the 24-hour container
• Ask the patient to void, collect it, and note the start time
• Begin collecting urine at exactly midnight regardless of the patient's voiding schedule

Correct answer: Discard the patient's first voiding, then begin collecting all subsequent voidings

To begin a 24-hour urine collection, the patient voids and that first specimen is discarded. The collection clock starts at that point, and ALL subsequent urine for the next 24 hours is collected. This ensures a complete 24-hour measurement.

A 24-hour urine collection measures substances excreted by the kidneys over an entire day, such as creatinine, protein, or hormones. The process: (1) Note the start time when the patient first voids — discard this void. (2) Collect ALL urine for the next 24 hours into the large container, which may contain a preservative. (3) Keep the container refrigerated or on ice throughout the collection. (4) At exactly 24 hours after the start time, have the patient void one final time — this IS collected. (5) Send the container to the lab promptly. Missing any void or failing to refrigerate can invalidate the test.

Question 3: When collecting a urine specimen from a patient with an indwelling Foley catheter, where should the CNA obtain the sample?

• From the drainage port on the catheter tubing using a sterile syringe (Correct answer)
• By disconnecting the catheter from the drainage bag and draining into a cup
• Directly from the urine drainage bag
• By removing and reinserting the catheter

Correct answer: From the drainage port on the catheter tubing using a sterile syringe

Urine specimens from Foley catheters must be obtained from the designated sampling port on the catheter tubing using a sterile syringe and needle or needleless system. The drainage bag contains old, potentially contaminated urine and should never be used for specimens.

The correct method for obtaining a catheter urine specimen: (1) Clamp the tubing below the sampling port for 15-30 minutes to allow fresh urine to accumulate. (2) Clean the sampling port with an alcohol wipe and allow to dry. (3) Insert a sterile syringe into the port and aspirate the needed amount (usually 10-30 mL). (4) Transfer the urine into a sterile specimen container. (5) Label appropriately and send to the lab. Never collect from the drainage bag because this urine can be hours old and contaminated. Never disconnect the catheter-bag junction because this breaks the closed system and introduces infection risk.

Question 4: A patient needs a stool specimen for occult blood testing. What food should the patient avoid before this test?

• Red meat, raw vegetables, and aspirin (Correct answer)
• Dairy products and eggs
• Citrus fruits and juices
• Caffeinated beverages and chocolate

Correct answer: Red meat, raw vegetables, and aspirin

Before a fecal occult blood test (FOBT), patients should avoid red meat (contains blood), certain raw vegetables like radishes and turnips, vitamin C supplements, and aspirin/NSAIDs that can irritate the GI tract and cause false positives or negatives.

Fecal occult blood testing detects hidden (occult) blood in stool, which can be an early sign of colorectal cancer or other GI conditions. Dietary restrictions (typically 3 days before testing) include: Red meat (beef, lamb, pork) because hemoglobin can cause false positives; Raw turnips, radishes, broccoli, and cantaloupe contain peroxidase enzymes that mimic the test reaction; High doses of vitamin C can cause false negatives by blocking the chemical reaction; Aspirin and NSAIDs may cause GI irritation and minor bleeding. The CNA should educate patients about these restrictions and document patient understanding.

Question 5: When collecting a stool specimen, how much stool is typically required?

• About the size of a walnut (1-2 tablespoons) (Correct answer)
• An entire bowel movement
• Just a small smear on the collection card
• A full specimen cup

Correct answer: About the size of a walnut (1-2 tablespoons)

For most stool specimens, a walnut-sized amount (approximately 1-2 tablespoons) is sufficient. The exact amount may vary by test type, but this is the general guideline. For FOBT cards, a small smear from two different parts of the stool is used.

The amount of stool required varies by test type: (1) Culture or ova and parasite testing: about 1-2 tablespoons placed in a sterile container with or without preservative. (2) Fecal occult blood test (FOBT) cards: a thin smear from two separate areas of the stool applied to the card windows. (3) C. difficile testing: liquid or soft stool in a clean container, about 5-10 mL. Important collection rules: use the tongue blade or collection spoon provided, do not contaminate stool with urine or toilet water (use a specimen hat in the toilet), label the container with patient name/date/time, and send to lab promptly or refrigerate as instructed.

Question 6: A patient needs a sputum specimen for culture. When is the best time to collect this specimen?

• First thing in the morning before eating or drinking (Correct answer)
• After the patient eats a large meal
• In the afternoon when the patient has been active
• At bedtime after the patient has been resting all day

Correct answer: First thing in the morning before eating or drinking

Sputum is best collected early in the morning upon waking, before eating or oral hygiene. Secretions pool in the lungs overnight, making it easier to produce a true sputum sample with the most concentrated bacteria.

Optimal sputum collection technique: (1) Collect early morning before eating, drinking, or brushing teeth to avoid diluting or contaminating the sample. (2) Have the patient rinse their mouth with plain water (NOT mouthwash which kills bacteria). (3) Instruct the patient to take several deep breaths and cough forcefully from deep in the lungs — NOT just spit saliva. (4) Collect at least 5-10 mL of sputum (not saliva) in a sterile container. (5) If the patient cannot produce sputum, try chest physiotherapy, nebulizer treatment, or nasotracheal suctioning as ordered. (6) Label immediately and transport to the lab within 2 hours or refrigerate. Proper sputum (not saliva) is thick, possibly discolored, and comes from deep airways.

Question 7: A wound culture has been ordered. What is the CNA's role in this procedure?

• Gather supplies, provide privacy, and assist as directed by the nurse (Correct answer)
• Collect the wound culture independently using a sterile swab
• Perform the wound culture only if trained and competency-verified
• Wound cultures are always done by the physician — CNAs have no role

Correct answer: Gather supplies, provide privacy, and assist as directed by the nurse

Wound culture collection is typically performed by a nurse or physician. The CNA's role is to gather the necessary supplies, ensure patient privacy and comfort, maintain a clean environment, and assist the nurse as directed during the procedure.

While scope of practice varies by state and facility, in most settings CNAs do not independently collect wound cultures. The CNA's supportive role includes: (1) Gathering supplies: sterile culture swabs, dressings, gloves, drape, lighting. (2) Identifying and positioning the patient for access to the wound. (3) Maintaining privacy by closing curtains and door. (4) Holding wound edges open if directed by the nurse. (5) Disposing of contaminated materials properly. (6) Documenting the time the nurse collected the specimen. (7) Transporting the labeled culture tube to the lab per policy. Understanding the wound culture process helps CNAs provide better assistance: the nurse cleans the wound edges, swabs the wound bed (not the exudate surface), and sends the swab in transport media to detect bacterial growth.

Question 8: What is the correct action when a urine specimen cannot be sent to the lab immediately after collection?

• Refrigerate the specimen and transport within 2 hours (Correct answer)
• Leave it at room temperature for up to 4 hours
• Add a preservative tablet regardless of test type
• Collect a new specimen — delayed specimens are always discarded

Correct answer: Refrigerate the specimen and transport within 2 hours

Urine specimens should be refrigerated (not frozen) if they cannot be immediately transported to the lab. Refrigeration slows bacterial growth and preserves the specimen's integrity. Most urine specimens should reach the lab within 2 hours of collection.

Urine specimen storage guidelines: (1) IDEAL: Transport to lab within 30 minutes of collection at room temperature. (2) REFRIGERATED: If not immediately transported, refrigerate at 2-8°C. Most urine specimens remain viable for up to 24 hours refrigerated, though 2 hours is the standard target for accuracy. (3) PRESERVATIVES: Some 24-hour urine collections use preservative tubes (boric acid, hydrochloric acid) — the type depends on the test ordered. Do not assume all specimens need preservatives. (4) DO NOT FREEZE routine urine specimens. (5) DOCUMENT: Note the collection time and any delay in transport. A specimen left at room temperature for more than 2 hours may show: bacterial overgrowth (false positive culture), breakdown of casts (missed diagnosis), elevated pH, altered glucose levels. When in doubt, check with the nurse before discarding.

Question 9: What information is typically included on the laboratory requisition form that accompanies a specimen?

• Patient name, DOB, test ordered, collection date/time, and ordering physician (Correct answer)
• Only the patient name and room number
• The test ordered and specimen type only
• Patient name and insurance information only

Correct answer: Patient name, DOB, test ordered, collection date/time, and ordering physician

A complete lab requisition form includes the patient's full name, date of birth, medical record number, the specific test ordered, collection date and time, specimen source/type, and the ordering physician's name. This information ensures the right test is performed on the right patient.

Laboratory requisition forms are critical documents that accompany every specimen. Standard required information: (1) Patient identifiers: full name, date of birth, medical record number. (2) Test ordered: specific test name and/or lab code (e.g., UA with culture, CBC, HbA1c). (3) Specimen information: type (urine, blood, stool), collection site, collection date and time. (4) Ordering physician: name and provider number. (5) Diagnosis or ICD code: required for billing and test interpretation. (6) Priority: routine, STAT, or timed collection. (7) Special instructions: fasting status, any medications that may affect results. The CNA should verify that the requisition information matches the specimen label before transport. Discrepancies must be reported to the nurse before the specimen leaves the unit.

Question 10: Standard precautions apply to which of the following?

• All patients regardless of their diagnosis or known infection status (Correct answer)
• Only patients with known infectious diseases
• Only patients in isolation rooms
• Only when a patient has blood or stool contact

Correct answer: All patients regardless of their diagnosis or known infection status

Standard precautions apply to EVERY patient in EVERY encounter, regardless of whether they have a known infection. Standard precautions treat all blood, body fluids, secretions, and excretions as potentially infectious. This protects both patients and healthcare workers.

Standard Precautions are the foundation of infection prevention in healthcare, established by the CDC and OSHA. Key components: (1) HAND HYGIENE: Before and after every patient contact. (2) PPE: Gloves for any contact with blood/body fluids; add mask, gown, eye protection based on risk. (3) SHARPS SAFETY: Never recap, proper disposal in sharps containers. (4) RESPIRATORY HYGIENE: Cover coughs/sneezes, provide masks and tissues to coughing patients. (5) SAFE INJECTION PRACTICES: One needle, one syringe, one patient. (6) ENVIRONMENTAL CLEANING: Proper disinfection of equipment between patients. Standard Precautions differ from Transmission-Based Precautions (Contact, Droplet, Airborne) which are ADDED for specific pathogens like MRSA, influenza, or tuberculosis. CNAs must understand both systems.

Question 11: A CNA is collecting a urine specimen and notices the urine is dark brown and has a strong odor. What should the CNA do?

• Collect the specimen, note the observations, and report to the nurse (Correct answer)
• Discard the specimen because it appears abnormal
• Add more water to the specimen to normalize the color
• Collect the specimen but do not report the abnormal appearance

Correct answer: Collect the specimen, note the observations, and report to the nurse

The CNA should collect the specimen as ordered, note the abnormal characteristics (color, odor, clarity), and immediately report the observations to the nurse. Abnormal urine appearance is clinically significant and must be communicated — it may indicate dehydration, infection, liver disease, or other conditions.

Observing and reporting urine characteristics is an important CNA skill. Normal urine is pale to medium yellow, clear, and has a mild odor. Abnormal findings to report: (1) DARK BROWN or tea-colored: may indicate liver disease, hemolysis, or certain medications. (2) RED or pink: possible blood (hematuria), beets, or certain medications. (3) CLOUDY or turbid: possible infection, mucus, or sediment. (4) STRONG AMMONIA ODOR: concentrated urine (dehydration) or breakdown of urea by bacteria. (5) FOUL or fishy odor: possible urinary tract infection. (6) VERY PALE/CLEAR: possible overhydration or diabetes insipidus. Document: the time of collection, appearance of urine, and report to the nurse before the specimen is sent. This information helps the nurse determine if additional tests are needed.

Question 12: After removing gloves following specimen collection, the CNA notices a small tear in the glove. The CNA's skin was not visibly contaminated. What is the correct action?

• Wash hands thoroughly with soap and water and report to the nurse (Correct answer)
• Apply hand sanitizer only since skin appears uncontaminated
• Report it only if the patient has a known infectious disease
• No action needed if skin appears intact and not contaminated

Correct answer: Wash hands thoroughly with soap and water and report to the nurse

Any glove integrity compromise during specimen collection requires thorough handwashing with soap and water and a report to the nurse. Even if the skin appears intact, microscopic exposure may have occurred. The nurse will assess and document the potential exposure per facility protocol.

Glove failure during specimen collection is a potential bloodborne pathogen or body fluid exposure event. Required actions: (1) IMMEDIATELY: Remove all gloves carefully using the glove-within-glove technique. (2) HAND HYGIENE: Wash hands with soap and water for at least 20 seconds — use soap and water (not just sanitizer) for potential blood/body fluid exposure. (3) ASSESS: Check skin for any breaks, cuts, or open areas. (4) REPORT: Inform the charge nurse or supervisor immediately, even if skin appears intact. (5) DOCUMENT: An incident/exposure report may be required per facility policy. (6) FOLLOW PROTOCOL: The supervisor will determine if exposure workup is needed based on facility bloodborne pathogen exposure control plan. Early reporting is essential — delayed reporting can affect options for post-exposure prophylaxis if needed.

Question 13: A patient's blood glucose reading must be documented. Which information is MOST important to record?

• The exact numerical reading, date, time of collection, and the patient's symptoms (Correct answer)
• Only the date and reading value
• The reading and whether it was high or low
• The date, time, and type of glucometer used

Correct answer: The exact numerical reading, date, time of collection, and the patient's symptoms

Accurate glucometer documentation must include the exact numerical value, the date, the time of collection, and any patient symptoms at the time of testing. This information is essential for trending glucose patterns and recognizing hypoglycemia or hyperglycemia in context with the patient's clinical condition.

Complete blood glucose documentation includes: (1) EXACT READING: The specific number in mg/dL — never document 'WNL' or 'normal' without the value. (2) DATE AND TIME: Critical for pattern recognition (pre-meal, post-meal, fasting) and correlating with symptoms or interventions. (3) PATIENT SYMPTOMS: Document any signs of hypoglycemia (shakiness, diaphoresis, confusion) or hyperglycemia (thirst, polyuria, fatigue) at the time of testing. (4) WHO PERFORMED the test. (5) SITE USED: Fingertip, alternate site. (6) ACTIONS TAKEN: Any notification of nurse, interventions per order. (7) GLUCOMETER ID: Some facilities record the device ID for quality control. Critical values (below 70 or above 400 mg/dL) must be reported to the nurse immediately and documented as 'reported to RN [name] at [time].' Documentation creates the legal record of patient care and is essential for medication dosing decisions.

Question 14: A resident needs a clean-catch midstream urine specimen. Which instruction should the CNA give first?

• Begin urinating, then collect the sample
• Clean the urethral area with the provided wipes before urinating (Correct answer)
• Collect urine directly into the specimen cup from the start
• Refrigerate the cup before collecting the sample

Correct answer: Clean the urethral area with the provided wipes before urinating

The perineal area must be cleaned with antiseptic wipes before collection to prevent contamination of the specimen.

Question 15: When collecting a stool specimen for occult blood testing, the CNA should avoid which of the following?

• Using a wooden tongue depressor to transfer the sample
• Placing the sample in the designated specimen container
• Collecting the sample after the resident ate red meat recently (Correct answer)
• Labeling the container with the resident's name

Correct answer: Collecting the sample after the resident ate red meat recently

Red meat consumption before fecal occult blood testing can cause a false-positive result, so dietary restrictions must be followed.

Question 16: A urine specimen must be sent to the lab but will not be transported for 30 minutes. The CNA should:

• Leave the specimen at room temperature
• Refrigerate the specimen until transport (Correct answer)
• Add a preservative from the supply closet
• Discard and collect a fresh specimen at transport time

Correct answer: Refrigerate the specimen until transport

Urine specimens not transported immediately should be refrigerated to prevent bacterial growth and specimen degradation.

Question 17: While collecting a sputum specimen, the CNA notices the resident has produced only saliva. The CNA should:

• Label and send the saliva sample to avoid delay
• Ask the resident to rinse with water and try again with a deep cough (Correct answer)
• Mix the saliva with the small amount of mucus present
• Document that the specimen was collected successfully

Correct answer: Ask the resident to rinse with water and try again with a deep cough

Sputum must come from the lower airways via a deep cough; saliva is not an acceptable sputum specimen and the collection should be repeated.

Question 18: A 24-hour urine collection is in progress. The resident voids at 2 PM and the urine is accidentally discarded. What should the CNA do?

• Continue the collection and note the missed void in the chart
• Notify the nurse, as the 24-hour collection may need to restart (Correct answer)
• Add extra water to the collection container to compensate
• End the collection early and send what has been collected

Correct answer: Notify the nurse, as the 24-hour collection may need to restart

A discarded specimen during a 24-hour urine collection compromises accuracy, so the nurse must be notified and the collection typically restarted.

Question 19: When using a urine dipstick test at the bedside, which action ensures the most accurate result?

• Shake excess urine off the strip and read after exactly the time specified on the bottle (Correct answer)
• Hold the strip under running water after dipping to remove excess urine
• Read the results immediately after dipping before any color change occurs
• Store opened dipstick bottles in the refrigerator between uses

Correct answer: Shake excess urine off the strip and read after exactly the time specified on the bottle

Shaking off excess urine and reading the strip at the manufacturer's specified time interval ensures accurate color comparison and results.

Question 20: After completing a specimen collection procedure, the CNA's priority action before leaving the room is to:

• Document the collection in the medical record immediately
• Remove gloves and perform hand hygiene (Correct answer)
• Place the specimen in the transport bag and seal it
• Notify the nurse that the specimen is ready

Correct answer: Remove gloves and perform hand hygiene

Removing gloves and performing hand hygiene is the priority to prevent transmission of pathogens after any specimen collection.