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

Module 6 Lab Exercise I: Quality Control and Construction of Levey -Jennings Charts. Levey-Jennings Activity Objectives. At the completion of this activity, you will be able to:

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

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

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

  3. 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.

  4. Last Month’s QC Values (Glucose mg/dL)For Establishing the QC Ranges • Calculate the Mean: __________ • Calculate Std Dev: __________ • Calculate %CV: __________ • Determine • + 3 SD Range: ____________ • 5. Construct graph & plot all points

  5. 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

  6. Now Plot the following QC Values (Glucose mg/dL)

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

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

  9. 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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