ICPI ICPI Laboratory Medicine Standards and Quality 2 — Questions and Answers
Question 1: What is the chain of custody in forensic and clinical laboratory specimens?
- The hierarchy of supervisors in a hospital laboratory department
- A documented record tracking who handled a specimen from collection to final disposition (Correct answer)
- The legal process for subpoenaing laboratory records in court
- The sequence of tests performed on a single specimen
Correct answer: A documented record tracking who handled a specimen from collection to final disposition
Chain of custody documentation ensures that every person who handled a specimen is recorded, preserving the specimen's legal and scientific integrity.
Question 2: Why is proper specimen labeling critical in clinical laboratory medicine?
- Mislabeled specimens can result in a wrong patient receiving incorrect test results or treatment (Correct answer)
- Labels are required only for billing and have no diagnostic impact
- Specimen labels are primarily for inventory management purposes
- Only frozen specimens require labeling for storage purposes
Correct answer: Mislabeled specimens can result in a wrong patient receiving incorrect test results or treatment
Mislabeling a specimen can cause results to be attributed to the wrong patient, leading to incorrect diagnoses and potentially harmful treatment decisions.
Question 3: The clinical significance of a reference range in laboratory testing is that it:
- Represents the exact normal value for every individual patient
- Defines the range of values observed in a healthy reference population, helping interpret patient results (Correct answer)
- Sets the maximum allowable cost per test for insurance reimbursement
- Specifies the shelf life of laboratory reagents and kits
Correct answer: Defines the range of values observed in a healthy reference population, helping interpret patient results
Reference ranges represent the central 95% of values in a healthy population and provide context for interpreting whether a patient's result is unusual.
Question 4: Critical values in clinical laboratory reporting require:
- Immediate billing to the insurance company before treatment begins
- Immediate notification to the responsible clinician due to the life-threatening nature of the result (Correct answer)
- Repeat testing on a second instrument before any action is taken
- Documentation in the laboratory's annual quality report only
Correct answer: Immediate notification to the responsible clinician due to the life-threatening nature of the result
Critical values represent results at life-threatening extremes that require immediate clinician notification so urgent intervention can be initiated.
Question 5: Point-of-care testing (POCT) differs from central laboratory testing in that it:
- Provides more accurate results than central laboratory analyzers
- Is performed near the patient using portable devices, enabling faster clinical decisions (Correct answer)
- Requires less quality oversight because results are used informally
- Is only authorized for use by physicians, not nurses or other staff
Correct answer: Is performed near the patient using portable devices, enabling faster clinical decisions
POCT is performed at or near the patient using portable analyzers, reducing turnaround time and enabling rapid clinical decisions in urgent situations.
Question 6: In anatomic pathology, which quality control measure helps ensure consistent staining quality across tissue slides?
- Using a single technologist for all staining to minimize variability
- Running positive and negative control tissues with each staining batch (Correct answer)
- Staining slides only when a pathologist is present to review immediately
- Photographing each unstained slide before applying any reagents
Correct answer: Running positive and negative control tissues with each staining batch
Positive and negative control tissues confirm that stains are working correctly and that results are valid for patient slides in the same batch.
ICPI ICPI Laboratory Medicine Standards and Quality 2
What is the chain of custody in forensic and clinical laboratory specimens?