Due to system upgrades, please note the following. Orders can be placed in the online store but will be fulfilled after 7/14/2025. Learning activities ordered will be available immediately after order placement. CAP is committed to processing orders as quickly and securely as possible during this upgrade. Thank you for your patience.
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ACCURACY-BASED VITAMIN D - ABVD
ABVD
Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS).
Analyte
Challenges per Shipment
Number of Shipments
25‑OH vitamin D (D2 and D3)
3
Two shipments per year
Calcium
3
Additional Information
The Centers for Disease Control and Prevention (CDC) will establish reference targets using isotope-dilution LC-MS/MS method.
Specimens are collected by a modified application of Clinical Laboratory and Standards Institute Guideline CLSI C37-A, Preparation and Validation of Commutable Frozen Human Serum Pools as Secondary Reference Materials for Cholesterol Measurement Procedures; Approved Guideline.
Program Information
Three 1.0‑mL liquid human serum specimens
Serum is from multi-donor endogenous pools
Conventional and International System of Units (SI) reporting offered
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