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Module GLP-10 · Version 1.0

Reading a Levey-Jennings Chart

Learn to read a Levey-Jennings quality-control chart: plot control results against the target mean and SD limits, recognize isolated extremes, shifts, trends, increased scatter, and cyclical patterns, and connect the timing of a pattern to reagent, calibration, maintenance, environment, or operator events without treating the chart alone as a cause.

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Who this module is for

Clinical laboratory scientists, medical laboratory technicians, and laboratory trainees who run and interpret daily internal quality control on quantitative analyzers.

Learning objectives

  • Plot control results against a target mean and plus or minus 1, 2, and 3 SD limits on a Levey-Jennings chart
  • Recognize isolated extremes, shifts, gradual trends, increased random scatter, and alternating or cyclical patterns
  • Connect the timing of a chart pattern to reagent, calibration, maintenance, environment, or operator events recorded in the event log

How completion works

Mark every required section done and answer every knowledge check in those sections correctly. The final save completes the module automatically.

Sources

10 sources

  1. 1. 42 CFR 493.1256, Standard: Control procedures. Centers for Medicare & Medicaid Services.

    Source note · federal regulation

  2. 2. 42 CFR 493.1255, Standard: Calibration and calibration verification procedures. Centers for Medicare & Medicaid Services.

    Source note · federal regulation

  3. 3. Clinical and Laboratory Standards Institute. C24: Statistical Quality Control for Quantitative Measurement Procedures: Principles and Definitions, 4th ed., 2016.

    Source note · consensus standard

  4. 4. Clinical and Laboratory Standards Institute. EP23: Laboratory Quality Control Based on Risk Management, 2nd ed., 2023.

    Source note · consensus standard

  5. 5. Clinical and Laboratory Standards Institute. EP26: User Evaluation of Acceptability of a Reagent Lot Change, 2nd ed., 2022.

    Source note · consensus standard

  6. 6. College of American Pathologists. Accreditation Checklists.

    Source note · accreditation standard

  7. 7. Westgard JO, Barry PL, Hunt MR, Groth T. A multi-rule Shewhart chart for quality control in clinical chemistry. Clinical Chemistry. 1981;27(3):493-501.

    Source note · peer-reviewed literature

  8. 8. Giannoli JM, et al. Recommendations for the application and follow-up of quality controls in medical laboratories. Biochemia Medica. 2021;31(2):020501.

    Source note · peer-reviewed literature

  9. 9. National Institute of Standards and Technology. What do we mean by Normal data?, Engineering Statistics Handbook, section 6.5.1.

    Source note · professional society guidance

  10. 10. Levey S, Jennings ER. The use of control charts in the clinical laboratory. American Journal of Clinical Pathology. 1950;20(11 TS):1059-1066.

    Source note · peer-reviewed literature