Culture media intended for clinical diagnostic use — including viral transport media used in patient specimen collection — may be regulated by FDA as in vitro diagnostic devices. Products sold solely for research or industrial fermentation purposes typically fall outside device regulation, but the intended use stated on labeling and in marketing materials is the determining factor. Importers should consult FDA's device classification database and, if necessary, a regulatory affairs specialist before entry.

CBP expects product documentation — such as a certificate of analysis, product insert, or technical data sheet — that confirms the medium is specifically formulated to maintain viral viability during specimen transport. Generic nutrient broths or agar preparations without that specific formulation and labeling would typically be classified under the broader 3821000090 line rather than the viral transport media line.