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UN 3373

Meaning

UN 3373 designates “Biological Substance, Category B,” a specific classification for diagnostic or investigational human or animal specimens that are not known to contain infectious substances capable of causing disease in humans or animals, but which are transported in a form where the potential for transmitting disease cannot be entirely ruled out. This classification ensures appropriate handling and transport protocols are applied to protect public health and maintain sample integrity, especially for specimens critical to assessing physiological states such as hormonal balance.