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Specimen Bag Labeling Requirements for Canadian Laboratories: PHAC and Transport Canada Standards

July 29, 2026

Specimen Bag Labeling Requirements for Canadian Laboratories

Introduction

In Canadian clinical laboratories, proper specimen bag labeling is governed by two federal authorities: the Public Health Agency of Canada (PHAC) and Transport Canada under the Transportation of Dangerous Goods (TDG) Regulations. Laboratories that handle, store, or ship diagnostic specimens must comply with both biosafety and dangerous goods frameworks to ensure worker safety and regulatory conformity. Failure to meet these standards can result in penalties, shipment rejection, and compromised laboratory accreditation.

PHAC Biosafety Guidelines for Specimen Labeling

PHAC's Canadian Biosafety Standard (CBS), second edition, sets mandatory requirements for handling and storage of biological materials. Under CBS Section 4.4 — Identification and Labelling, all biological materials must be clearly labelled with the biohazard symbol, the name of the infectious substance, and relevant risk group information. PHAC directs that containers and specimen bags display the universal biohazard symbol in a contrasting colour, along with a notation of the substance or a reference to a detailed manifest.

PHAC also requires specimen bags used for transport or storage be leak-proof, tear-resistant, and sealable. Laboratories must label each bag with the collection date and the name or identification number of the submitter, consistent with the Canadian Biosafety Handbook (CBH).

Transport Canada TDG Regulations for Diagnostic Specimens

Transport Canada's TDG Regulations adopt the United Nations Model Regulations and ICAO Technical Instructions. Under Part 2 — Classification, diagnostic specimens fall under UN 3373 — Biological Substance, Category B, provided they are not known to contain a Category A pathogen. This classification dictates specific labelling and packaging requirements for all modes of transport.

TDG Regulation Section 4.15 requires that each means of containment bear the UN 3373 mark in a diamond-shaped format with the text "UN 3373" and "Biological Substance, Category B." This mark must be visible and legible, measuring at least 15 mm by 15 mm. The outer packaging must also display the proper shipping name and a 24-hour emergency contact number when required.

Specimen Bag Labeling Requirements for Canadian Laboratories

UN 3373 Classification and Its Impact on Labeling

The UN 3373 designation applies to clinical samples — blood, urine, tissue, swabs, and other biological materials — that have a low probability of containing infectious substances. This classification reduces administrative burdens while maintaining rigorous safety standards. The label must be a diamond shape with a black border on a contrasting background, enclosing the UN number and "Biological Substance, Category B."

Every specimen bag prepared for off-site transport must carry the UN 3373 mark on the outer packaging or on the bag itself if it serves as the outermost layer. Intra-facility transports may be exempt from TDG marking, but PHAC biosafety labelling still applies.

Triple Packaging System and Corresponding Labels

Both PHAC and Transport Canada mandate the triple packaging system for diagnostic specimen transport:

Primary container — a leak-proof tube or vial labelled with the patient identifier and specimen type.
Secondary container — a leak-proof, sealable specimen bag (such as CliniEco's Self-Sealing Specimen Bags) containing the primary container with sufficient absorbent material. This bag must bear the biohazard symbol and UN 3373 marking if it is the outermost layer.
Tertiary (outer) packaging — a rigid outer box with the UN 3373 diamond label, proper shipping name, and shipper/consignee information.

The secondary container is where specimen bag labelling is most critical. PHAC requires the biohazard symbol; Transport Canada requires the UN 3373 mark. Many laboratories use a CliniEco Self-Sealing Specimen Bag as the secondary container.

Biohazard Symbols and Patient Information Requirements

The biohazard symbol is the most universally recognized marking on specimen bags. Under PHAC's CBS, the symbol must be red, orange, or black on a contrasting background. The symbol should be a minimum of 15 mm in height for laboratory storage and larger (typically 30 mm) for transport packaging. Patient information is governed by provincial privacy legislation (PIPEDA federally, PHIPA in Ontario). Specimen bags must include sufficient patient identifiers — typically full name, date of birth, and health card number — while ensuring confidentiality.

Conclusion

Canadian laboratories face a dual regulatory environment: PHAC governs biosafety labelling for in-house handling, while Transport Canada TDG Regulations govern labelling for transport. Compliance requires specimen bags clearly marked with the biohazard symbol, UN 3373 classification (when applicable), patient identifiers, and traceability information. By integrating these requirements into standard operating procedures — and choosing high-quality specimen bags — laboratories can ensure safety, regulatory conformity, and uninterrupted operations.