StacksVerified U.S. regulatory reference

9 CFR §439.51

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Upon a determination by the Administrator, a laboratory will be placed on probation for the following reasons:
  1. (a)If the laboratory fails to complete more than one inter-laboratory accreditation maintenance proficiency testing sample analysis within 12 consecutive months, unless written permission is granted by the Administrator.
  2. (b)If the laboratory does not respond to ALP inquiries related to its participation in the program or fails to meet any of the requirements or criteria set in this part.
  3. (c)If the laboratory does not successfully demonstrate the maintenance of quality assurance capabilities including its results from inter-laboratory accreditation maintenance proficiency testing samples. ALP evaluation criteria are based on the ISO 13528 standard, to include performance evaluation by z score statistics.