Quick facts
- A pipette tip is the disposable interface between a pipette and the liquid being measured. It is not neutral hardware: the tip is the part that touches the specimen, and its fit decides the volume.
- United States: the article is classified by how it is promoted. 21 CFR 862.2050 covers general purpose laboratory equipment "labeled or promoted for a specific medical use", in Class I.
- Canada: there is no promotion trigger of that shape. A tip is a non-invasive device and falls to Class I under Rule 7(1) of Schedule 1 to the Medical Devices Regulations, SOR/98-282.
- Accuracy belongs to the assembly, not the tip. ISO 8655-2:2022 sets maximum permissible errors for piston-operated pipettes, and that performance is measured with a tip fitted.
- The Canadian clause that lifts the class is Rule 7(2)(a), which sends a device sold as a calibrator, tester or quality control support to another device to Class II.
- The purchase test is fit, filter or no filter, and the volume range, in that order.
A pipette tip is bought in bulk, handled in thousands and specified almost never. The two countries classify it by different logic, and the difference is worth understanding because it decides what a supplier has to be able to show. This article sets out what a tip does, how each country classifies it, what the ISO 8655 series requires of the assembly, which tip formats fit which work, and what a laboratory should verify on delivery.
What is a pipette tip, and why does it carry the accuracy of the assembly?
A pipette tip is a moulded cone that seals against the pipette's shaft or piston and holds the liquid column. Two geometries dominate: air-displacement tips, where an air cushion separates the piston from the liquid, and positive-displacement tips, where a piston moves inside the tip itself and the liquid contacts only the tip.
Three properties decide whether a tip will do the job:
- Fit. A tip that does not seal evenly against the shaft leaks air, and an air leak changes the volume. Fit is the property that a laboratory notices last.
- Filter or no filter. A filter tip guards the pipette shaft against aerosol and cross-contamination, which matters when the pipette is used across specimens.
- Wetting and retention. Low-retention surfaces reduce the film of liquid left inside the tip, which matters at small volumes.
21 CFR 862.2050 puts the article's regulatory position in one sentence: general purpose laboratory equipment "is a device that is intended to prepare or examine specimens from the human body and that is labeled or promoted for a specific medical use". The tip reaches the section through the promotion, and that is the whole test.
How do the Canadian and United States rules treat a pipette tip differently?
| Item | Canada | United States |
|---|---|---|
| Entry that catches a pipette tip | None; class derived by rule | 21 CFR 862.2050, general purpose laboratory equipment, Class I |
| What triggers the classification | The article's intended use as a device | The promotion for a specific medical use |
| Product sold with no medical promotion | Not a device | Not a device |
| Default class for a tip sold for specimen work | Class I under Rule 7(1) | Class I (general controls) |
| Clause that lifts the class | Rule 7(2)(a), calibrator, tester or quality control support to another device | Not present in this shape |
| Premarket position | Licence only where the derived class requires one | Exempt from premarket notification, subject to § 862.9 |
| Who holds the licence or registration | Manufacturer, importer or distributor | Manufacturer or repackager |
The United States section is unusual because it sits in the part of the regulation that deals with hematology and pathology devices, and it classifies by promotion rather than by construction. A tip and a benchtop instrument can therefore both land in the same Class I section if both are promoted for preparing or examining specimens from the human body, while an identical tip sold as generic plasticware is outside the device framework altogether.
Canada reaches Class I by rule. Rule 7(1) sends all other non-invasive devices to Class I, and a tip that touches a specimen during processing is non-invasive and otherwise unclassified. Rule 7(2)(a) is the clause worth flagging: a device intended to act as a calibrator, tester or quality control support to another medical device is Class II. A calibration tip set sold as a verification accessory for a pipette can therefore be Class II in Canada even where the working tips are Class I.
What does ISO 8655 require of the assembly?
The ISO 8655 series is the document a laboratory can point a supplier to when the question is performance rather than class. ISO 8655-2:2022 covers piston-operated volumetric apparatus and sets out requirements for pipettes, including the maximum permissible errors for the nominal volume and the conditions for the test.
Four consequences follow for a buyer:
- A tip is part of the tested assembly. The errors are stated for the pipette, and the measurement is taken with a tip fitted. A substitution changes the assembly.
- Verification is a laboratory duty. A laboratory accredited to ISO 15189:2022 has to control the equipment it uses, and that control extends to how the pipetting step is verified.
- Traceability runs through the balance. A gravimetric check is only as good as the balance used for it, which is why the check procedure names the balance.
- The record belongs with the instrument. The verification record, the tip type and the date belong together in the equipment file, not in a purchase file.
That is why a tip change is not a procurement footnote. When a laboratory changes tip brand or filter format, the pipetting step has to be re-checked before the change is relied on.
Which tip format fits which work?
| Format | What it is for | What a buyer should confirm |
|---|---|---|
| Universal tip, 10 to 200 microlitres | Routine bench work on a single-channel pipette | Fit for the specific pipette model |
| Filter tip | Aerosol protection and cross-contamination control | Whether the filter is hydrophobic |
| Low-retention tip | Small volumes and viscous or surfactant-rich liquids | Stated retention claim |
| Positive-displacement tip | Volatile or viscous liquids, and where the sample must not touch the shaft | Piston design and tip compatibility |
| Wide-bore tip | Whole cells and suspensions that shear in a narrow cone | Bore diameter |
| Serological pipette | Volumes above one millilitre transferred to a tube or flask | Graduation and colour code |
The format choice is a workflow decision. A filter tip costs more per tip than a plain tip, so it is usually reserved for work where the pipette crosses between specimens; a low-retention tip is reserved for small volumes where the residual film is a material fraction of the volume.
What should a laboratory verify on delivery?
Four checks keep a tip line from becoming a source of unexplained variation:
- Fit on the labelled pipette. Test a tip on the model it was bought for before the box goes into rotation.
- Lot and sterility statement. Where the tip is sold sterile, the box carries the lot and, where applicable, the irradiation or sterilisation reference.
- Volume range printed on the box, not inferred from the colour. Colour codes vary between suppliers.
- One change at a time. A tip change and a pipette change made in the same week cannot be separated afterwards.
Which consumables does a pipetting station go through?
A pipetting station restocks tips, tubes, specimen containers, gloves, disinfectant and waste bags in the same cycle. For laboratories buying at case level, the wholesale ordering page sets out account and case pricing, and the B2B wholesale collection lists the lines held for institutional buyers. The graduated leak-proof specimen cup, 100 per pack is the line we hold for bench and collection work, and laboratories that also run an in-house sterilizer can start with the biological indicator 5-pack trial and read the sterilization monitoring collection for the monitoring lines.
Sources
- 21 CFR 862.2050, general purpose laboratory equipment labeled or promoted for a specific medical use
- 21 CFR 864.6160, manual blood cell counting device
- ISO 8655-2:2022, piston-operated volumetric apparatus, pipettes
- Medical Devices Regulations, SOR/98-282, full text, Schedule 1
- ISO 15189:2022, medical laboratories, requirements for quality and competence
- World Health Organization, Laboratory biosafety manual
- Health Canada, medical devices
- openFDA device classification database
- FDA device classification database search
- FDA CLIA waived analytes database
- Public Health Ontario, laboratory test information index
- Public Health Ontario, infectious diseases
- CCOHS, osh answers
- CCOHS, personal protective equipment
- Clinical and Laboratory Standards Institute
- Institute for Quality Management in Healthcare
- College of Medical Laboratory Technologists of Ontario
- Ontario, Laboratory and Specimen Collection Centre Licensing Act
- Ontario Ministry of Health
- World Health Organization, blindness and visual impairment fact sheet
Related reading
- Serological pipettes in Canada vs the US: which class and colour code
- Specimen cups in Canada: MDL pathway vs FDA classification
- Sterile specimen container storage and handling in Canada
- Centrifuge tubes 15 mL vs 50 mL: stocking a clinic laboratory
CliniEco Medical supplies eye care, laboratory and clinic consumables of the kind described in this article. Health Canada MDEL #35334. This article is written for laboratory, procurement and clinic professionals and is not clinical or accreditation guidance; equipment verification and method validation belong to the laboratory director.
Frequently Asked Questions
Is a pipette tip a medical device in the United States?
It is a device only when it is promoted for a specific medical use. 21 CFR 862.2050 covers general purpose laboratory equipment that is intended to prepare or examine specimens from the human body and is labeled or promoted for a specific medical use, and places it in Class I. The same tip sold as generic plasticware is outside the device framework.
Does Canada classify a pipette tip by promotion?
No. The Medical Devices Regulations do not contain a promotion trigger of that shape. A tip sold for specimen work is a non-invasive device and falls to Class I under Rule 7(1) of Schedule 1 unless a more specific rule applies.
Can a pipette tip be Class II in Canada?
Yes, in one situation. Rule 7(2)(a) classifies a device as Class II when it is intended to act as a calibrator, tester or quality control support to another medical device. A tip set sold as a verification accessory for a pipette is the kind of article that clause reaches.
What does ISO 8655-2 require?
It covers piston-operated volumetric apparatus and sets out requirements for pipettes, including maximum permissible errors against nominal volume and the conditions of the test. The performance is stated for the pipette with a tip fitted, which is why a tip change is a change to the tested assembly.
Does changing tip brand require re-verification?
Not by rule, but by good practice in a controlled laboratory system. ISO 15189 places the control of equipment and materials with the laboratory, so where a change could shift the delivered volume, the pipetting step should be re-checked before the change is relied on, and the record belongs in the equipment file.
What should a laboratory check on a tip delivery?
Fit on the labelled pipette model, the lot and sterility statement on the box, the volume range printed by the supplier rather than inferred from a colour code, and whether the delivery introduces more than one change at a time. Colour codes are supplier-specific and are not a specification.
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