Current Evaluation Protocol
[Last Updated: 05/21/2018]
- CAP: College of American Pathologists
- NYS: The New York State Department of Health no longer provides proficiency testing samples.
- WSLH: Wisconsin State Laboratory of Hygiene
- CAP: 2017 BL-B to 2018 BL-A
- WSLH: Event 2017-2 to Event 2018-1
12 months or equivalent time period
- CAP: 3 surveys
- WSLH: 3 surveys
When new survey results are received, drop the oldest survey results and add the newest survey results to determine current status.
89% (or greater) acceptable sample results
- CAP: 14 out of 15 acceptable
- WSLH: 14 out of 15 acceptable
Individual sample results are acceptable if they are within 6 µg/dL of the target value (or all-method mean) if that value is less than 40 µg/dL; or within 15% of the target (or all-method mean) if that value is greater than 40 µg/dL. ALL proficiency test (PT) samples are evaluated by OSHA.
For the CAP and WSLH surveys, OSHA will also approve laboratories that achieve 89% in the prior 4 surveys (which is approximately 12 months).
Laboratories are evaluated based on the program they have requested. CAP sends results to OSHA only at the request of the laboratory. WSLH send all results to OSHA, but coded by a laboratory code number. Laboratories must contact both OSHA and the PT program organization to be evaluated based on the WSLH program.
OSHA approval is now available to participants in the le Centre de Toxicologie du Quebec (CTQ) program. Contact OSHA and the CTQ for more information.
OSHA Limits for CAP Surveys
OSHA will evaluate ALL PT samples without regard to laboratory agreement with the consensus value. The CAP target value and acceptable limits for the current evaluation are listed below:
CAP Sample Number
Target Value (µg/dL)
OSHA Limits (µg/dL)