Levey-Jennings Control Chart The figure at the right shows a Levey-Jennings cont

Question

Levey-Jennings Control Chart The figure at the right shows a Levey-Jennings control chart developed to monitor control analytes run along with blood samples in a clinical laboratory. A control measurement above the upper control line or below the lowerB control line indicates a potential problem with the analytical method for that run upper control line control sample mean lower control line The values for the mean and the two control lines are determined by multiple analyses of a control sample of the analyte. 9 Rún number 13 15 In setting up such a control chart for the analysis of blood calcium, ten analyses of a control sample yielded the following values, in mg/dL: 11.8 12.1 11.5 11.3 12.011.3 11.911.8 11.3 11.7 What values should be on the chart in positions A, B, and C? Number Number Number mg dL mg dL dL

Explanation / Answer

Write the given values (mg/dL) in descending order

12.1

12.0

11.9

11.8

11.8

11.7

11.5

11.3

11.3

11.3

Upper control line in mg/dL

A = 12.1

Lower control line in mg/dL

C = 11.3

Control sample mean in mg/dL

B = (12.1 + 11.3)/2

= 11.7

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