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Blood Lead Laboratories

Current Evaluation Protocol

[Last Updated: 09/21/2018]

Programs Evaluated

Surveys Evaluated

  • CAP: 2018 BL-A to 2018 BL-B
  • WSLH: Event 2018-1 to Event 2018-2

Evaluation Period

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.

Evaluation Criteria

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 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 sends all results to OSHA, the results are sent using 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)

BL-11 7.593 1.6-13.6
BL-12 4.408 0.0-10.4
BL-13 4.160 0.0-10.2
BL-14 0.909 0.0-6.9
BL-15 22.417 16.4-28.4
BL-1 2018 6.083 0.08-12.1
BL-2 1.204 0.0-7.2
BL-3 4.415 0.0-10.4
BL-4 2.905 0.0-8.9
BL-5 17.881 11.9-23.9
BL-6 5.198 0.0-11.2
BL-7 20.496 14.5-26.5
BL-8 1.498 0.0-7.5
BL-9 0.792 0.0-6.8
BL-10 40.018 34.02-46.02
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