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UN 3373

Meaning

UN 3373 is the United Nations number assigned to “Biological Substance, Category B,” a classification for infectious substances not in Category A that are transported in a form capable of causing permanent disability, life-threatening or fatal disease in otherwise healthy humans or animals. In the context of hormonal health and wellness, this classification is critical for the safe and compliant shipping of patient biological samples, such as blood, urine, or saliva specimens, to a laboratory for hormone testing. Proper packaging and labeling according to UN 3373 guidelines are mandatory for all carriers to ensure public safety.