Internal Quality Control and Validation

The basic principle of QC is to measure a stable sample and identify values that are unexpected by comparison to...

• Range of patient specimens

• Bottle values from the manufacturer's assay sheet

• Mean value and SD determined in the laboratory

• I don't know

Based on good laboratory practice, how frequently should Quality Control materials be tested for any one test?

• Each day of testing

• More than once per day if the test is not stable

• All above

Which of the following Westgard Rules primarily detect Random Error?

• 10x

• 2_2s

• 1_3s

• 2 of 3_2s

Given a QC procedure 12s as a Warning rule - what does that mean?

• Reject the run whenever one value is out 2s control limits

• Repeat the control whenever one value is out 2s control limits

• Warning of possible problems if one value is beyond 2s control limits

• Reject the run whenever two values are in 1s control limits

If the light source on an instrument is gradually weakening, it could contribute to what type of error?

• Random error

• Systemic error

• Both

• None of the above

Which of the following Westgard Rules primarily detect Systematic Error?

• 1_2s

• 2_2s

• 1_3s

• All the above

Task: Run 2 controls on a Sodium test, low level and high level control. The QC rules for this test is 1_{2s warning .}

Question: When one level is out more than 2 SD control limits, what is the response?

• Repeat the control

• Run a new control

• Reject the run; trouble-shoot

• Accept the run "Warning Rules"

• I don't know

Task: Running 3 controls for Ammonia test. The QC rules for this method is 1_2s Warning.

Question: When one control is out 2 SD , what is the response?

• Repeat the control

• Run a new control

• Reject the run, trouble-shoot

• Accept and run "Warning Rules"

• I don't know

"Westgard Rules" include a 1_2s"warning rule." When the warning rule is violated, what action do you take?

• Repeat the control

• Run a new control

• Check the other "Westgard Rules"

• Accept and run "Warning Rules"

• I don't know

Which of the following multirule combinations is considered "Westgard Rules"?

• 1_2s/2_2s/R_4s

• 1_2s/2_2s/R_4s/4_1s/10x

• 1_2s/2_2s/R_4s/4_1s

• 1_2s/2_2s/R_4s/4_1s/10_x/2of3_2s

• I don't know