The Ridewell Cargo blog
Straight answers on moving medical cargo.
Plain-English guides on chain of custody, specimen packaging and medical transport, for the lab, hospital and transplant teams who depend on them. Every guide opens with a short answer and cites its sources.
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02
Questions answered
20
Primary sources cited
08
Last updated
Oct 22, 2026
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10 questions answered
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Oct 22, 2026
10 questions answered
5 min read
Oct 22, 2026
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20
questions answered across 2 guides
Chain of custody
Glossary
Terms, defined.
The words that come up on every medical run, each in one sentence, with a link to the guide that explains it in full.
Chain of custody
The signed, chronological record of who held a shipment, when, where and in what condition, from pickup to handoff.
UN3373
The UN number for “Biological substance, Category B”, shown in a diamond on the outer package.
Category B
Infectious substances not in a form generally capable of causing permanent disability or life-threatening disease.
Triple packaging
Primary receptacle, leakproof secondary packaging and rigid outer packaging, nested one inside the next.
Minimum necessary
The HIPAA standard that limits use and disclosure of health information to what a task requires.
STAT
Clinical shorthand for “immediately”: a shipment that cannot wait for a scheduled run.
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