For a Canadian lab, a 95 kPa specimen bag has to do three things on paper as well as in transit: prove the pressure rating, carry the UN3373 marking where the sample is a Category B biological substance, and hold a document pouch that keeps the requisition separate from the sample. A bag that passes the pressure test but has no document pouch, or a pouch that is not sealed, is the usual reason a specimen is rejected at intake. Labs and clinics running courier routes stock bags built for this, such as these 95 kPa certified specimen transport bags, rather than reusing a plain zip bag.
This is a documentation checklist for buyers and lab managers: what to verify on the bag, what to write on it, and what to keep on file so an audit or a courier query can be answered without a phone call.
What does the 95 kPa rating actually certify?
The rating states the bag can withstand a 95 kPa pressure differential without leaking — the condition packaging has to survive for air transport of a Category B substance. It is a performance property of the bag, and it is separate from the drop and puncture requirements of the outer packaging. On a compliant bag the rating is printed on the bag or the case, so a buyer can point to it rather than describe it.
Which markings and paperwork does a Canadian lab expect on a specimen bag?
| Item | What it looks like | Why the lab checks it |
|---|---|---|
| Pressure rating | "95 kPa" printed on bag or box | Supports the transport claim on the requisition |
| UN3373 marking | Diamond marking on the outer packaging | Required for Category B biological substances |
| Document pouch | Separate outer pocket, sealable | Keeps the requisition out of the sample compartment |
| Absorbent layer | Pad or 3-wall construction | Contains a leak without soaking the requisition |
| Biohazard symbol | Printed on the bag face | Handler identification at intake and at the bench |
| Lot number | Printed on bag or case | Traceability if a batch is queried |
What should be written on the bag, and where?
Patient identifiers and the collection time go on the requisition inside the document pouch, not on the sample compartment, so a leak cannot destroy the paperwork. The sample compartment carries the specimen label with the patient name, the collection date and time, and the test requested. If your facility uses a barcode, the label goes on the tube inside the bag and a matching copy on the requisition. Never write on the outside of the sample compartment with a marker that can smear — ink transfer onto the specimen label is a common rejection reason.
What documentation should a clinic keep on file?
Three things: the bag specification sheet or a photo of the printed 95 kPa rating and UN3373 marking, the case lot numbers with the dates they were put into use, and the courier agreement that states the packaging the route accepts. For a lab that audits suppliers, a bag without a printable specification is a bag you cannot verify. Ask for the sheet with the first order, not after a rejection.
Where do most specimen rejections actually come from?
Not from the rating. In practice the failures cluster around labelling and sealing: an unsealed document pouch, a label that names the patient on one tube and not another in the same bag, a bag overfilled so the zip will not close, or a requisition folded into the sample compartment. All of those are fixable at the bench with a written routine and a supply of the right bag size. Review the bench routine against this checklist once a quarter.
Make it repeatable: print the compliance log templates, use the same page as your free log generator, and ask a compliance specialist when a result is unclear.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers. Reselling? become a distributor.
Related reading
What 95 kPa certification means · Which container closure prevents transport leaks · 95 kPa specimen bag labelling in Canada
Frequently Asked Questions
What does 95 kPa mean on a specimen bag?
It is the pressure differential the bag withstands without leaking, the condition packaging has to survive for air transport of a Category B substance.
Do all specimen bags need a UN3373 marking?
Packaging for a Category B biological substance carries the UN3373 marking. Routine non-infectious samples may not, but the marking is the safe default for courier routes.
Where should the requisition be placed?
In the separate document pouch on the outside of the bag, never in the sample compartment.
What documents should a clinic keep for specimen packaging?
The specification sheet or a photo of the printed rating, the case lot numbers with dates in use, and the courier agreement listing accepted packaging.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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