UN3373 refers to Biological Substance, Category B, a classification for lower-risk items like clinical specimens or cultures that don't pose severe threats.



These shipments need tight rules from bodies like IATA for air and DOT for ground to keep everyone safe, preserve sample quality, and avoid legal issues. Sticking to these standards protects lives and boosts trust in global transport networks.

Section 1: Deconstructing UN3373 – What Are Biological Substance, Category B?

Defining Biological Substance, Category B (UN3373)



Biological Substance, Category B covers items that might hold microbes but won't cause death or lasting harm. Think of it as the "safer" side compared to Category A, which handles deadly agents under UN2814 or UN2900. Official guidelines from WHO and IATA say a substance fits here if it doesn't lead to permanent disability or life-threatening illness, even in small amounts. Labs classify samples based on known risks—unknown pathogens often land in this group too. This setup lets you ship vital materials without full hazardous goods treatment.

Regulatory Frameworks Governing UN3373 Shipments

IATA's Dangerous Goods Regulations guide air shipments worldwide, while DOT's 49 CFR rules ground transport in the US. International mail follows UPU standards to match these. Each country adds its own twists, so mismatches can halt your package. Check the destination's rules early—Europe might demand extra forms, for example. These frameworks aim to balance safety with efficiency, ensuring biological shipments move smoothly across borders.

Key bodies: IATA for flights, DOT for US roads and rails.

Global reach: Aligns with UN Model Regulations for consistency.

One tip: Use online tools from carriers like FedEx to verify local needs before packing.

Common Examples of UN3373 Materials

You see UN3373 on everyday lab items like blood samples for routine tests or throat swabs from clinics. Non-recombinant viral cultures from research also qualify, as long as they stay low-risk. ⁠

Read More :UN3373 Specimen Packaging

Human or animal tissues for diagnostics fit too, if no high-threat pathogens lurk inside. These aren't exotic threats but building blocks for health checks and studies. Farms ship vet samples under this code, helping track animal diseases without panic.