M22-A3 introduced several significant changes from the previous M22-A2 version based on extensive surveys by the :
It applies to all commercial media regardless of packaging, such as plates, tubes, or bottles. Major Updates in the Third Edition (A3) clsi m22a3 pdf
Use the standard to establish rigorous QC protocols for every lot. such as plates
Quality Control for Commercially Prepared Microbiological Culture Media; Approved Standard, M22A3E, Published by CLSI, 2004-06-20 Go to product viewer dialog for this item. CLSI M22-A3-2004 (R2016) Published by CLSI
Focus on visual inspection and documentation of media upon receipt rather than full organism-based retesting for "exempt" media.
Excessive moisture, dehydration, or frozen/melted agar. Contamination: Any visible growth or excessive bubbles. Purchasing and Access