Which statement is true about UN 3373 labeling?

• A. It signified a biological substance Category B
• B. It is used exclusively for Dry Ice shipments
• C. It is optional for Category B
• D. It never appears with a proper shipping name

Answer: (A)

UN 3373 labeling identifies Biological Substances, Category B. This designation is used for materials like clinical specimens that pose a limited biosafety risk, not the higher-risk infectious substances in Category A. The label signals to handlers that the package contains a biological substance that requires Category B shipping practices, including proper packaging and labeling, but without the stricter controls of Category A. It isn’t tied to Dry Ice shipments, which have their own labeling and UN number. The label is required for Category B shipments and is accompanied by a proper shipping name, such as “Biological substance, Category B,” along with the UN number. So the statement that UN 3373 labeling signifies a biological substance Category B is the accurate one.