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Module 6 Lab Exercise I: Quality Control and Construction of Levey-Jennings Charts

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Levey-Jennings Activity Objectives At the completion of this activity, you will be able to: 1.Perform statistical analysis on analyte values from the previous month’s control values, both normal and abnormal levels, to determine Mean, SD, %CV. 2.Draw a Levey-Jennings chart, label the x and y axis correctly, and properly label the LJ chart for documentation and filing. 3.Plot current month’s values daily and evaluate LJ chart for Westgard single rule violations, trends, shifts. 4.Discuss the necessity of Quality Control Result documentation and how they assess precision and accuracy.

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Quality Control Exercise #1 Quality control sample measurement is used to test the analytical phase of patient testing. This first exercise provides quality control sample results to calculate statistics and establish a Levey-Jennings chart.

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Last Month’s QC Values (Glucose mg/dL) For Establishing the QC Ranges Day 1 68Day 8 80Day 15 68 Day 2 82Day 9 75Day 16 75 Day 3 79Day 10 68Day 17 70 Day 4 69Day 11 77Day 18 78 Day 5 70Day 12 82Day 19 73 Day 6 79Day 13 74Day 20 75 Day 7 80Day 14 72 1.Calculate the Mean: __________ 2.Calculate Std Dev: __________ 3.Calculate %CV: __________ 4.Determine + 3 SD Range: ____________ 5. Construct graph & plot all points

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Instrument: _________________Test: ____________________Units: ________ Method: ____________________Month/Year: ______________Tech: ________ Control: ____________________Lot #: ____________________Exp: _________ Control Mean: _______________1 Std Dev: ________________ -+3 SD Range: ___________ + 3s - 2 s + 1 s Mean - 1 s + 2 s - 3 s Days 1234567891011121314151617181920

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Now Plot the following QC Values (Glucose mg/dL) Day 1 75Day 8 80Day 15 68 Day 2 73Day 9 75Day 16 75 Day 3 78Day 10 77Day 17 70 Day 4 69Day 11 68Day 18 79 Day 5 70Day 12 82Day 19 82 Day 6 79Day 13 74Day 20 68 Day 7 80Day 14 72

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This is what the LJ Chart should look like including plotted data

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Exercise #2 Evaluate the following QC chart by identifying out of control data, outliers, shifts, and trends

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Key QC Lecture Activity #2 3 circled areas and 2 pointers note analytical problems shown by patterns of QC results. What are they?

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