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WorksheetsQUIZ PRACTICAL 2 WESTGARD RULES
Total questions: 10
Worksheet time: 8mins
Based on good laboratory practice, how frequently should Quality Control (QC) 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 applies Random Error?
10x
2 of 3₂s
1₃s
2₂s
The basic principle of QC is to measure a stable sample and identify values that are unexpected by comparison to
Range of patient specimens.
Mean value and standard deviation (SD) determined in the laboratory.
Reagent deterioration.
Pipetting error.
Given a QC procedure 1₂s as a WARNING RULE, what does that mean?
Reject the run whenever two values are in 1s control limits.
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.
If the light source on, an instrument is gradually weakening, it could contribute to what type of error?
Both
Random error
Systematic error
None of the above
Which of the following Westgard Rules primarily applies Systematic error?
1₂s
2₂s
1₃s
All the above
Run 2 controls on sodium test, low level and high level control. The QC rules for this test are 1₂s warning.
Accept the run “Warning Rules”.
Run a new control.
Reject the run and troubleshoot.
Repeat the control.
Which of the following multirule combinations is considered as Random error?
1₃s/R₄s
1₂s/1₃s
4₁s/2₂s
R₄s/4₁s
When 2 QC are out (more than 2SD control), what is the respond?
Reject the run and troubleshoot.
Accept and run sample.
Check possibility of rule of Westgard
Repeat the control.
Rule 10x or “ten-mean” used as a warning rule, how does a laboratory implement this?
Repeat the control whenever 10 values are on one side of the mean.
Reject the run whenever x values are 10SDs from the mean.
Warning of a possible problem is indicated when 10 values are on one side of the mean. Further investigation should be conducted.
Reject the run whenever 10 values are on one side of the mean.
