Specimen Containers 90 mL vs 120 mL: Which Does a Canadian Lab Stock?
A laboratory bench that runs out of urine cups mid-week is usually a laboratory that ordered by case instead of by test. The 90 mL graduated cup and the 120 mL sterile screw-cap container are the two vessels most Canadian collection sites hold, and they are not interchangeable. Choosing between them is a question of what the test needs, not of unit price.
How do the two standard volumes differ?
A 90 mL graduated cup is a wide-mouth polypropylene vessel with millilitre marks moulded up one side and a press-on lid. It is designed for collection where volume matters and the specimen is not expected to stay sterile: midstream urine, 24-hour pool aliquots and similar routine work. The graduations are the point of the design, because a collector, a courier and a technologist all need to see at a glance whether enough sample was given.
A 120 mL sterile screw-cap container is a narrower vessel, supplied sterile, closed with a threaded lid and usually stripped with a patient label carrying name, date, room and specimen type. It is used when the specimen must arrive without added environmental organisms, and when the lid has to resist a courier journey without weeping.
| Item | 90 mL graduated cup | 120 mL screw-cap container |
|---|---|---|
| Typical use | Midstream urine, pooled aliquots | Sputum, stool, tissue, sterile specimens |
| Sterility | Non-sterile | Supplied sterile |
| Closure | Press-on lid | Threaded screw cap |
| Graduations | Millilitre marks on the wall | Not graduated |
| Label | Applied by the site | Printed patient label, plus site label |
| Case quantity | 600 cups, six boxes of 100 | 200 containers, two cases of 100 |
Which volume does a Canadian lab stock?
Both, and in different multiples. The graduated cup is the higher-volume consumable because urine is the highest-volume routine specimen in most collection sites. The sterile screw-cap container moves in lower numbers, because it is reserved for tests that specify it. A site that stocks only one of the two ends up either wasting sterile vessels on urine or sending non-sterile cups to a culture that asked for a sterile container.
The practical sizing rule is to count tests, not patients. If the site collects a midstream urine for a third of visits and a sterile specimen for one visit in twenty, the order ratio between the two lines will drift far from one to one, and a single blended case order will run the wrong line out first.
What does the laboratory manual actually specify?
Volume per test is set by the laboratory, not by the supplier, which is why a provincial manual is the document that settles the question. Alberta Precision Laboratories, for example, directs readers of its urine collection guidelines to the test directory for specific urine test volumes and preservatives rather than publishing one number for all urine work. Public Health Ontario runs the same way, with per-test criteria in its test information index and a separate acceptance page for everything that applies to all specimens.
That structure is the reason a label on a product page will never tell a site which container to buy. The volume the method needs comes from the testing laboratory's own instructions, and the container is selected to match.
What do the acceptance rules require regardless of volume?
Two identifiers, and they have to agree with the paperwork. Public Health Ontario's criteria for acceptance of specimens require the container to be labelled with the patient's full name, or a unique code in the case of anonymous testing, plus one other unique identifier such as date of birth or health card number, along with the date of collection and, for time-sensitive tests, the time. The requisition has to match the specimen label, and the ordering provider must be authorized to order testing in Ontario under section 18 of Ontario Regulation 45/22.
Two further conditions are container-independent and apply to both volumes: the packaging must meet the minimum federal Transportation of Dangerous Goods requirements, and the specimen must not be leaking. A short sample, a mismatched label or a weeping lid are the three reasons a specimen is refused, and none of them is fixed by buying a different size cup.
Does the container determine how the specimen is transported?
No, and this is where size gets confused with packaging. A 90 mL cup does not travel on its own. It travels inside an absorbent-lined secondary bag with the requisition in an outer pouch, and the bag, not the cup, is what satisfies the transport requirement. The same is true of a 120 mL container. Sites that stock 95 kPa specimen bags alongside both container lines avoid the situation where the specimen is collected correctly and then packed in a way the receiving laboratory cannot accept.
What should sit beside the two container lines?
A working collection bench holds the container, the transport bag, the absorbent, and the labelling supplies, because a specimen is only accepted when all four are in place. It also holds a stool or similar collection kit for the tests that need a scoop, and a graduations-free screw-cap line for sterile work.
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.
The two container lines described here are 90 mL graduated leak-proof sample cups at 600 cups to the case and a 120 mL sterile screw-cap specimen container supplied 200 to the case. Both travel in 95 kPa UN3373 specimen transport bags, and a sterile stool collection kit with scoop and label covers the tests that need one. Everything sits together in laboratory consumables, and the collection workflow is set out in the diagnostic laboratories guide.
References
- Public Health Ontario, Criteria for Acceptance of Specimens (checked 29 September 2026)
- Alberta Precision Laboratories, Urine specimen collection guidelines (checked 29 September 2026)
- Ontario Regulation 45/22, Laboratory and Specimen Collection Centre Licensing Act (checked 29 September 2026)
- CLSI, Clinical and Laboratory Standards Institute standards catalogue (checked 29 September 2026)
Related Reading
- Specimen Collection Containers for Canadian Labs: Urine Cups, Cary-Blair and 24-Hour Collection
- Sterile Specimen Containers: Leak Testing and Labelling Rules
- How Should Canadian Labs Store and Handle Sterile Specimen Containers?
Frequently Asked Questions
Which specimen container does a Canadian lab stock, 90 mL or 120 mL?
Most labs stock both. The 90 mL graduated cup is the routine midstream urine container, and the 120 mL sterile screw-cap container takes specimens that need a sealed sterile vessel, such as sputum, stool or tissue.
Why is the 90 mL cup graduated?
Urine collection needs a visible volume so the collector can confirm enough sample was given and so a short sample is obvious at the bench. The cup still goes into a transport bag with the requisition, because the graduation does not replace the label.
Does a 120 mL container need to be sterile?
Only where the test requires it. A sterile screw-cap container is used when the specimen must not pick up environmental organisms, which is why the sterile line is stocked separately from non-sterile collection cups.
What has to be written on a specimen container in Ontario?
Public Health Ontario requires the patient's full name or a unique code, plus one other unique identifier such as date of birth or health card number, and the date of collection, with the requisition matching the label.
Does container size change how the specimen is shipped?
No. Volume changes the container, not the packaging rule. Ontario laboratories expect packaging that meets the federal Transportation of Dangerous Goods requirements, with the specimen not leaking.
Last updated: September 2026. CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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