Quality Control

Question 1

Method is easily repeated

Answer 1

Practicability

Question 2

Maintain accuracy and precision

Answer 2

Reliability

Question 3

Daily monitoring of accuracy and precision

Answer 3

Intralab/Interlab QC

Question 4

Proficiency testing (Reference lab)
Long-term accuracy
Difference of >2: not in agreement w/ other lab

Answer 4

Interlab/External QC

Question 5

Available for a min. of 1 yr

Answer 5

QC materials

Question 6

Graphic representation of the acceptable limits of variation

Answer 6

Shewhart Levey-Jennings Chart

Question 7

V-mask

Earliest indication of systematic errors (trend)

Answer 7

Cumulative Sum Graph (CUSUM)

Question 8

SD of 2 groups of data

Answer 8

F-test

Question 9

Means of 2 groups of data

Answer 9

T-test

Question 10

Improper product manufacturing
Unpurified analyte
Altered protein

Answer 10

Matrix effect

Question 11

Degree of flatness or sharpness

Answer 11

Kurtosis

Question 12

Control rules + Control chart

Answer 12

Multirule Shewhart procedure

Question 13

Westgard: at least 40 samples

Answer 13

Test method

Question 14

Westgard: preferably 100 samples

Answer 14

Reference method

Question 15

Tripod:
Program development
Assessment and monitoring
Quality improvement

Answer 15

Quality Assurance

Question 16

Referred to as absurd value

Answer 16

Physiologic Limit

Question 17

Control and patient specimens assayed, evaluated, and report together

Answer 17

Analytical Run

Question 18

Causes:

• Improper calibration
• Deterioration of reagents
• Contaminated solution
• Sample instability/unstable reagent blanks
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• Diminishing lamp power
• Incorrect sample and

Answer 18

Systematic error (Inaccuracy/Determinate)

Question 19

29% of errors (lab results)

Answer 19

Nonlab. personnel

Question 20

Preferred (Human: biohazard)

Not for immunochem, dye-binding and bilirubin

Answer 20

Bovine control materials