You have received your proficiency test results from the accrediting agency and note that your creatinine result was unacceptable at greater than 2 SDI from the group mean.The value that was entered on your survey report form was 15 mg/dL.The group method mean was 1.3 mg/dL with a method standard deviation of 0.3 mg/dL.You realize that your laboratory made an error in entering the result.If you had entered 2.0 mg/dL as the result on your survey report,would the recalculated SDI now be in agreement with the rest of the laboratories in the testing program?

Question

Quizplus · Accepted Answer

To calculate the revised SDI, we first need to calculate the Z-score for the original result (15 mg/dL):

Z-score = (individual value - group mean) / method standard deviation
Z-score = (15 - 1.3) / 0.3
Z-score = 44.33

Since the Z-score is greater than 2 SDI from the group mean, the result is considered unacceptable.

Now, let's calculate the Z-score for the revised result (2.0 mg/dL):

Z-score = (2.0 - 1.3) / 0.3
Z-score = 2.33

This Z-score is within 2 SDI of the group mean, indicating that the revised result would be considered acceptable. Therefore, the answer is A) Yes.

You Have Received Your Proficiency Test Results from the Accrediting