CMT Laboratory Quality Control and Management 3

Question 1

What is the analytical measurement range (AMR) of a laboratory test?

Accepted Answer

The range of analyte concentrations that can be measured directly without specimen modification

Answer

The range of values considered clinically normal for a healthy patient population

Answer

The range of QC values accepted without triggering a Westgard rule violation

Answer

The range of values reported by an external reference laboratory

Question 2

Which Westgard rule is triggered when four consecutive QC values all fall on the same side of the mean beyond ±1 SD, indicating a systematic shift?

Accepted Answer

4₁s rule

Answer

1₂s rule

Answer

2₂s rule

Answer

10ₓ rule

Question 3

In laboratory management, what does 'turnaround time' (TAT) measure?

Accepted Answer

The total time from specimen collection to result reporting to the clinician

Answer

The time required to complete a full QC testing cycle

Answer

The time interval between proficiency testing survey events

Answer

The time required to fully calibrate an automated analyzer

Question 4

What is the purpose of establishing reference ranges in a clinical laboratory?

Accepted Answer

To define the interval of values expected in a healthy reference population

Answer

To set QC acceptance limits for each analyte being measured

Answer

To determine the analytical measurement range for each test method

Answer

To calibrate instruments according to manufacturer specifications

Question 5

Which document provides the legally binding minimum quality standards for laboratory testing in the United States?

Accepted Answer

CLIA (Clinical Laboratory Improvement Amendments) regulations

Answer

ISO 15189 international standard

Answer

CLSI guidelines and consensus documents

Answer

CAP accreditation checklist and inspection requirements

Question 6

A laboratory notices that glucose QC results are consistently 5% above the target value for multiple consecutive days. This pattern most likely indicates:

Accepted Answer

Systematic positive bias, possibly due to reagent lot or calibrator issues

Answer

Random error due to imprecise pipetting technique by staff

Answer

Gross error from a contaminated QC material vial

Answer

A 1₃s Westgard rule violation from a single outlier value

Question 7

What is the primary purpose of performing method validation before implementing a new laboratory test?

Accepted Answer

To demonstrate that the method performs as expected for its intended clinical use

Answer

To train laboratory staff on the correct technique for the new procedure

Answer

To satisfy accreditation body requirements before the next inspection cycle

Answer

To establish QC frequency and control limits for the new test method