A Winnipeg diagnostic lab lost its transport audit on two points that had nothing to do with the analysers: the bags in use carried no pressure rating on the packaging, and the absorbent layer was missing from roughly one in five assembled specimens headed to a referral lab. Both failures traced to a single supply decision — a bulk bag bought on unit price rather than on the UN packing instruction the lab was already required to work to.
The rebuild took six weeks and cost less per unit than the bags it replaced. The lesson is that the 95 kPa figure is a packaging requirement, not a marketing line, and it has to be documented somewhere the auditor can see.
Below is what the lab changed, the specification that came out of it, and the sizing table most Canadian labs end up needing.
What did the 95 kPa requirement actually cover?
The number comes from the UN packing instruction P650 for Category B infectious substances (UN3373). The primary receptacle must withstand an internal pressure differential of 95 kPa without leakage, and the completed package must pass a 1.2 metre drop test. That pressure figure is roughly 13.8 psi, and it is why a plain zip bag with a printed biohazard symbol is not automatically suitable for referral transport.
Two consequences follow for a lab buyer. First, the pressure rating belongs to the primary receptacle, so it should appear on the bag specification sheet and on the case label, not only in a supplier catalogue description. Second, the requirement is differential — the bag has to hold the rating at the altitude and temperature range it will actually see, which for a Winnipeg winter means a cold chain that stiffens film.
The lab had been buying on price per bag. Nothing in its purchase history showed whether the film held 95 kPa, because the specification had never been written down.
Why did the original transport bags fail the audit?
Three findings, in the order the auditor raised them:
- No pressure rating on the case. The case carried a biohazard symbol and a size, but no pressure differential figure and no packing instruction reference.
- Absorbent layer not always present. Staff assembled bags from a mixed shelf where two SKUs looked identical and only one included the absorbent pouch.
- No written assembly step. The procedure manual described the courier booking in detail and the packaging itself in one sentence.
None of these are exotic. They are the same three findings that show up whenever a lab assembles bags from a mixed shelf, which is the practical argument for holding one 95 kPa SKU per size rather than chasing a lower unit price across two or three similar products.
What the lab changed
- Standardised on three UN3373 95 kPa sizes (6×9, 8×10, 12×15 inch) so every bench could name its size from memory.
- Rewrote the packaging step as a four-line card taped inside the bench cupboard: primary receptacle, absorbent, secondary bag with pouch, then hard outer packaging.
- Added the pressure rating and packing instruction to the case label check in receiving.
- Moved the referral courier list and the packaging card onto the same page so the two could not drift apart again.
The audit finding closed on the second visit. The cost per specimen went down slightly because the lab stopped writing off partly-used mixed stock.
How should a lab specify a 95 kPa specimen bag?
Write the specification before the quote, and make the supplier confirm each line in writing. The five lines below are the ones that survived contact with the auditor.
| Specification line | What to require | Why the auditor asks |
|---|---|---|
| Pressure differential | 95 kPa, stated for the primary receptacle | P650 requires it; a catalogue claim without a figure is not a specification |
| Packing instruction | P650 referenced on the case or insert | Lets the receiver match the bag to the transport paperwork |
| Absorbent | Absorbent pouch sufficient for the full primary volume | Covers a leaked receptacle inside the secondary packaging |
| Pouch | External document pouch, tamper-evident | Keeps the requisition with the specimen and out of the bag interior |
| Labelling | Biohazard symbol plus UN3373 marking on the case | Required marking; hand-written additions were the first audit objection |
Size selection follows volume, not preference. A 6×9 inch bag holds a single tube set and one requisition; 8×10 inch covers most multi-tube draws; 12×15 inch is the referral carton size for a batch being shipped together. Holding all three is what stops staff from over-bagging and from forcing a batch into a bag that will not close flat.
What does a compliant specimen bag order look like?
An order the lab can defend in an audit names the pressure rating, the packing instruction, the size, the case count, and the pouch style. Our UN3373 specimen transport bags, 12×15 inch carry the 95 kPa rating with an external document pouch for batch referral work, and the 6×9 inch 95 kPa bags suit single-draw benches. Both ship by the case so the shelf holds one product per size.
Read the current text of the packing instruction and your provincial transport requirements rather than a supplier summary, and keep the specification sheet in the same binder as the audit findings. That single file is what turns a repeat finding into a closed one.
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.
Related reading
- Laboratory consumables and sterilization supplies
- Biohazard bag intended use: what goes in
- Used test strips and lancets: waste separation for Canadian clinics
- compliance log generator
Buying for a facility rather than a single practice? Request a B2B quote and we will price your volume with Canadian warehouse delivery.
Frequently Asked Questions
What does 95 kPa mean on a specimen bag?
It is the pressure differential a Category B primary receptacle must withstand without leaking under UN packing instruction P650. In practical terms the bag film has to hold roughly 13.8 psi, and the figure should appear on the case or the specification sheet rather than only in a catalogue description.
Do I need a 95 kPa bag for every specimen leaving my lab?
It depends on the classification of what you are shipping. Category B infectious substances moving under UN3373 need P650 packaging, which is where the 95 kPa figure comes from. Routine internal movement within one building is a different question and should follow your own procedure.
What size specimen transport bag should a clinic keep?
Most Canadian clinics hold 6×9 inch for single draws with one requisition and 8×10 inch for multi-tube work. Labs that batch referrals to a reference site add the 12×15 inch size so a group of specimens can be packed in one go.
Does an absorbent pad have to be inside the bag?
The absorbent has to be able to take up the full primary receptacle volume if the receptacle leaks, which means it sits inside the secondary packaging with the specimen. Assembling bags from a mixed shelf is the usual reason this step gets skipped.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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