CLSI M22-A3 standard, titled "Quality Control for Commercially Prepared Microbiological Culture Media; Approved Standard—Third Edition,"
The "exempt" status means that if a laboratory receives a lot of media from a commercial manufacturer that has already performed QC (evidenced by a Certificate of Quality), the lab only needs to perform physical inspections clsi m22a3 pdf
A: Anaerobic media (e.g., Brucella blood agar) must be tested with anaerobes (e.g., Bacteroides fragilis) and, as a negative control, an aerobe that should not grow (e.g., Pseudomonas aeruginosa). Testing frequency—lot, shipment, or day—depends on risk assessment, but daily testing is common in high-complexity labs. Exempt Media : These are common, highly stable
Exempt Media: These are common, highly stable media types (like Blood Agar or MacConkey Agar) that have a proven track record of high quality from manufacturers. For these, laboratories can rely on the manufacturer's QC certificate rather than performing full in-house retesting, provided the lab verifies the storage conditions and physical integrity. Exempt Media : These are common
While you wait to purchase the official CLSI M22-A3 PDF, you can begin preparing your lab for compliance.