21 A series of LDH enzyme measurements on a control serum yield the following Me

Question

21 A series of LDH enzyme measurements on a control serum yield the following Mean 130 U/L SD 13 U/L Assuming that the data follow a typical normal distribution, approximately 32% of the data will fall outside which of the following ranges? A. B. C. D. 91-169 U/L 100-150 U/L 104-156 U/L 117-143 U/L 22. The process of providing adequate confidence that laboratory services satisfy the medical needs of the patient is a definition of Reference interval Coefficient of variation Quality assurance Quality control D. 23. Preanalytical factors that can affect analytical results include all but which of the following? Sample storage Centrifugation temperature ACS grade chemical standards Patient identification A. C. D. 24. To assure that the laboratory performance is in compliance with established standards, external quality control samples are periodically tested and evaluated by such agencies as the College of American Pathologists. How should these specimens be handled? A. They should be handled like any normal specimen B. They should be tested by the best technologist in the laboratory to ensure correct results C. They should be tested in triplicate and the results averaged D. They should be tested only by the chief technologist

Explanation / Answer

21) Mean LDH level is 130 U/L and SD is 13 U/L.

According to normal distribution curve, 1 SD on either side of curve includes 68% of the data, 2 SD on either side of the curve includes 95% of the values and 3 SD on either side of the mean will include 99.7% of the values.

So, from the data in question, 68% of the data will lie within 1 SD on either side of the mean. So, 32% of value lie outside 117-143 U/L. (option D).

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