CAP Pro Course - Laboratory Management - New Test Method Validation/Verification

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Author: DeRhonda Crawford, MT(ASCP)
Reviewers: Julie Ann West, PhD, MLS(ASCP)CM, SM(ASCP)CM

Continuing Education Credits

Objectives

  • Determine when a complete method validation is necessary and when performance verification is sufficient prior to implementing a new test method.
  • Choose an appropriate performance standard for the analyte being evaluated.
  • Determine the precision, accuracy, and total error of the test method and explain how to use this information to decide whether to accept the method.
  • Determine the reportable range and reference intervals.

Course Outline

  • Determine when a complete method validation is necessary and when performance verification is sufficient prior to implementing a new test method.
      • Validation vs Verification
      • Evaluation for a Qualitative Method
      • Method Validation for Specimens Other Than Those Approved by the Test Method Manufacturer
      • Other Situations When Method Verification is Required
      • Primary Responsibilities Related to Method Validation/Verification
      • Physicians want the laboratory to start performing amylase body fluid testing. The manufacturer makes no claim regarding any fluid testing other than ...
      • What are some ways a laboratory could test and document the absence of matrix-related bias in body fluids?
      • Which of the following processes should a laboratory include when validating a new test system versus verifying a new test system?
      • A laboratory is in the process of changing to a different method for analyzing urine amphetamines. Which tool can the laboratory use to compare qualit...
  • Choose an appropriate performance standard for the analyte being evaluated.
      • Recognizing Acceptable Analytical Performance
      • Total Error and Allowable Total Error
      • Which is included in the formula for calculating the total error of a test method?
      • What is a crucial step in the medical director's decision as to whether to accept a new method for glucose testing?
      • A laboratory reported an acetaminophen of 49.05 µg/mL on a proficiency testing (PT) survey. The total allowable error for acetaminophen is ±...
      • The laboratory medical director is trying to determine if the total error for amylase testing is acceptable. The allowable error is 6.0. The systemati...
      • What is the correct formula to use when determining the total error of a test method?
  • Determine the precision, accuracy, and total error of the test method and explain how to use this information to decide whether to accept the method.
      • Determining the Precision of a Test System
      • Determining the Accuracy of a Test System
      • Standard Deviation (SD) and Coefficient of Variation (CV)
      • Statistical Analysis of the Data Determine Acceptable Accuracy of the Method
      • Deciding Whether to Accept a New Method
      • How Can a Laboratory be Confident About The Decision to Accept or Reject the Method Being Evaluated?
      • Using the Method Decision Chart
      • Using the Method Decision Chart, continued
      • Documentation of Acceptance of the Validation/Verification Study
      • What does the bullseye image represent?
      • A laboratory performed a precision study for a total protein assay. An SD of 1.0 mg/dL was produced. What other information does the laboratory need t...
      • The chemistry supervisor reviewed the method performance data for albumin. The supervisor questioned the %CV for albumin. What %CV would represent goo...
      • The laboratory medical director is reviewing the evaluation of a new test method for potassium. What tool can the director use to help make an objecti...
      • A laboratory is bringing in new haptoglobin testing and needs to evaluate the assay for precision. How many different concentration levels should the ...
      • The State Laboratory is in the process of verifying the accuracy of a creatinine test. How many samples should be used spanning the reportable range o...
  • Determine the reportable range and reference intervals.
      • Reportable Range/ Analytical Measurement Range (AMR) Verification
      • Reference Interval Verification
      • What is the set of limits used to interpret patient test results?
      • When bringing in a new test method that will only be performed on males, what is the best way to perform a reference interval (reference range) study?
      • When evaluating 20 healthy individuals for a reference interval (reference range) verification study, two values fall outside acceptable limits. What ...
      • A laboratory is internalizing myoglobin testing and needs to evaluate the reference interval (reference range) for the new assay. How many samples sho...
      • What term best describes the range of analyte values that a method can be directly measured without dilution, concentration, or other pretreatment?
      • A laboratory is internalizing carbamazepine testing and needs to evaluate the new assay's analytical measurement range (AMR). What is the minimum numb...
  • References
      • References

Additional Information

Level of Instruction: Intermediate
Intended Audience: This program is designed as an educational and training tool for MLS, MT, and MLT personnel, medical laboratory science students and interns, pathology residents, and practicing pathologists.
Author: DeRhonda Crawford, MT(ASCP) is the chemistry supervisor at Gwinnett Medical Center in Lawrenceville, Georgia and the technical supervisor for the Gwinnett Medical Center in Duluth, Georgia. She holds a BS in Medical Technology from the Medical College of Georgia.
Reviewer Information: Dr. Julie Ann West is certified by the American Society for Clinical Pathology (ASCP) as a Medical Laboratory Scientist (MLS) and as a Specialist in Microbiology (SM). In addition, Dr. West has earned a PhD in Public Health - Infectious Disease Epidemiology - and is Certified in Public Health (CPH) by the National Board of Public Health Examiners. Dr. West is experienced as a Technical Specialist, Safety Officer, Educator, and Lead in the Veterans Administration Healthcare System, and has prior experience as an Administrative Laboratory Director.