There are three direct results of FDA factory inspections, namely NAI, VAI and OAI.
VAI stated that during the FDA factory inspection, the FDA inspector found that the factory’s management system violated FDA’s quality system regulations, and then issued a written form of non-conformity, or a "483" ".
The number of "483" may be 1, or it may be 20 or more. As long as the factory actively makes corrections in accordance with FDA's requirements and provides sufficient evidence, it will not lead to further consequences.
NAI stated that during the FDA factory inspection, no written non-conformities were issued (since the FDA's non-conformity report form is numbered 483, the FDA will also refer to the non-compliance as "483"), and It can be called "Zero 483".