Objectives In the United States, minimum standards for quality control (QC) are specified in federal law under the Clinical Laboratory Improvement Amendment and its revisions. Beyond meeting this required standard, laboratories have flexibility to determine their overall QC program. Methods We surveyed chemistry and immunochemistry QC procedures at 21 clinical laboratories within leading academic medical centers to assess if standardized QC practices exist for chemistry and immunochemistry testing. Results We observed significant variation and unexpected similarities in practice across laboratories, including QC frequency, cutoffs, number of levels analyzed, and other features. Conclusions This variation in practice indicates an opportunity exists to establish an evidence-based approach to QC that can be generalized across institutions.
- Quality control
- Quality control rules
- Westgard rules
ASJC Scopus subject areas
- Pathology and Forensic Medicine