Quick facts
- An automated blood cell counter is a Class II device in the United States at 21 CFR 864.5220.
- Canada regulates the counter as an in vitro diagnostic device. Used in diagnosis it reaches Class II through Rule 4 of Part 2 of the Medical Devices Regulations.
- Where the analyser is used with reagents and software that carry a higher class, Rule 7 gives both the class of the higher-risk device.
- The same counter used at the point of care is a near patient IVDD and is Class III under Rule 6.
- Quality-control material used to verify a run is a separate device in its own class, not part of the counter.
- The regulation text quoted here is current to 2026-09-21 and was last amended on 2026-06-17.
An automated blood cell counter counts and sizes the cells in a blood sample and reports a differential. It is the workhorse of a haematology bench, and it is one of the clearest examples of a device whose class depends on how it is used rather than on what it contains. The counter is the same instrument on both sides of the border; the route and the pairing rules are not.
What is an automated blood cell counter?
It is an instrument that draws a diluted blood sample through an aperture or a flow cell and counts cells by a change in impedance, light scatter or fluorescence. The result is a count per volume and, on a differential analyser, a breakdown by cell type.
The counter is an in vitro diagnostic device: it examines a specimen taken from the body, outside the body. It does not touch the patient and it does not deliver a treatment. That is why it sits in Part 2 of the Canadian rulebook, and why its class turns on the purpose of the test and on the reagents it runs with.
How do Canada and the United States classify an automated blood cell counter?
The counter is Class II in the United States, and in Canada its class follows its purpose and its reagents.
| Item | Canada | United States |
|---|---|---|
| Automated blood cell counter | Class II by Part 2 Rule 4 | Class II, 21 CFR 864.5220 |
| Counter used with higher-class reagents | Class of the higher-risk IVDD, Rule 7 | Accessory to the named entry |
| Counter used at the point of care | Class III by Part 2 Rule 6 | Depends on the entry and use |
| Quality-control material | Separate IVDD, own class | Separate entry, 21 CFR 862.1660 |
| What decides the class | Purpose, pairing and location | Which named entry it is filed under |
In the United States an automated blood cell counter is a named entry at 21 CFR 864.5220 and is Class II, and the differential counter sits in the same entry. In Canada no Part 1 rule names the counter, because it is an IVDD. Rule 4 of Part 2 classifies an IVDD used in diagnosis or patient management as Class II, unless it is used in screening for or diagnosis of cancer, in genetic testing, in screening for congenital disorders in the fetus, for disease staging, or where a wrong result would cause death or severe disability, in which case it is Class III.
Two further rules shape a haematology bench. Rule 7 is the pairing rule: where an IVDD, including its analysers, reagents and software, is intended to be used with another IVDD, both take the class of the higher-risk device. A counter that runs a reagent kit carrying a higher class climbs with the kit. Rule 6 is the near patient rule: a near patient IVDD is Class III, and near patient is defined as use outside a laboratory, at home or at the point of care.
Which licence and records differ between Canada and the United States?
The class decides the depth of the file, and the file has to match the way the counter is actually deployed.
In the United States a Class II device is placed on the market through the premarket notification route, and the manufacturer keeps the design, labelling and performance records that entry requires. In Canada a Class II IVDD needs a medical device licence supported by a quality-system certificate against ISO 13485, and a Class III IVDD carries a heavier application with a review of the performance evidence. A supplier that markets the counter for a clinic room and files it as a laboratory Class II instrument has not accounted for the near patient rule.
The pairing rule adds a second layer. A counter is rarely sold alone; it is sold with reagents, controls and software. Under Rule 7 the analyser and everything it is intended to be used with take the class of the highest-risk device in the set, so a laboratory cannot reason about the counter's class without also naming the reagents it runs.
Why does the counter's class depend on its reagents in Canada?
Because Part 2 grades an IVDD by purpose and by the set it belongs to, not by the instrument alone.
Rule 4 sets the base class at II for an IVDD used in diagnosis or patient management, then steps up to Class III for the enumerated high-risk purposes. Rule 7 then states that where an IVDD, including its analysers, reagents and software, is intended to be used with another IVDD, the class of both is that of the higher-risk device. Rule 8 is the fallback, placing all other IVDDs in Class I, and it applies only where no higher rule is engaged. Rule 6 places a near patient IVDD in Class III regardless of the base class.
Read as a set, the rules tell a supplier to describe the whole bench, not one box. Name the purpose of the test, name the reagents and controls the analyser is intended to run, and name where the analyser is used. Those three answers set the class, and the licence follows.
Which consumables does a haematology bench restock?
A haematology bench runs on the same items as any other laboratory station. The sterile graduated 90 mL specimen cups and the 120 mL sterile screw-cap container carry samples to and from the bench. Where the laboratory monitors its own steriliser, the sterilization monitoring collection pairs with the 24-hour monitoring five-pack trial. Laboratories and multi-site groups ordering at case level use the wholesale ordering page, and the B2B wholesale collection lists the lines held for institutional buyers. Reselling? become a distributor.
What do the two rulebooks actually say?
The two texts are short, and reading them side by side shows why the analyser is graded with its reagents.
| Rule or entry | Verbatim wording | Effect on a blood cell counter |
|---|---|---|
| Part 2 Rule 4, Canada | intended to be used in diagnosis or patient management is classified as Class II | Sets the diagnostic base class at II |
| Part 2 Rule 7, Canada | the class of both IVDDs will be that of the IVDD in the class representing the higher risk | Raises the counter with its reagents |
| Part 2 Rule 6, Canada | A near patient IVDD is classified as Class III | Moves a point-of-care counter to Class III |
| 21 CFR 864.5220, US | Automated blood cell counter | Named Class II entry |
| Rule 8, Canada | all other IVDDs are classified as Class I | Applies only where no higher rule is engaged |
Read together, the lines give a supplier a sequence. Name the purpose, name the reagent set, then name the location. The first answer sets Class II, the second lifts the counter with the higher-risk reagent, and the third lifts it to Class III at the point of care.
Sources
- 21 CFR 864.5220, automated blood cell counter
- 21 CFR 864.5425, multipurpose system for in vitro coagulation studies
- 21 CFR 864.7500, whole blood hemoglobin determination
- 21 CFR 862.1660, quality control material (assayed and unassayed)
- 21 CFR 864.1850, hematology stains
- Medical Devices Regulations, SOR/98-282, full text
- openFDA device classification API
- ISO 15189:2022, medical laboratories, requirements for quality and competence
- ISO 13485:2016, medical devices quality management
- ISO 14971:2019, risk management for medical devices
- CLSI, clinical and laboratory standards
- Public Health Ontario, laboratory services test index
- CCOHS, OSH answers
- Government of Canada, medical devices guidance
- College of Optometrists of Ontario, standards of practice
- Opto, eye health library
- American Academy of Ophthalmology, eye health
- Canadian Dental Association
- Royal College of Dental Surgeons of Ontario
- Standards Council of Canada
A count that is not tied to its control result cannot be defended when a value is questioned. The printable haematology run log is a blank sheet with columns for the run date, the analyser, the control lot, the control result and the patient result, so a suspect run is found from the page. The run record generator on the same page sizes the sheet to the number of analysers a laboratory runs. No account and no sign-up are needed to open either one.
Every laboratory layout is different. Ask a compliance specialist and you will get a written answer specific to your equipment and province, with the regulation or standard it is based on cited.
Related reading
- Blood Collection Tube Systems in Canada vs the US: Which Order Applies?
- P20 Pipette Volume Range and Colour Code in Canada
- Blood Glucose Test Systems in Canada vs the US: Which Class Applies?
CliniEco Medical supplies eye care, laboratory and dental consumables of the kind described in this article. MDEL #35334. This article is written for optometry, laboratory and procurement professionals and is not legal advice; the class of a device and the records kept by a clinic belong to the manufacturer and to the requirements that apply to it.
Frequently Asked Questions
Is an automated blood cell counter a Class II device in the United States?
Yes. An automated blood cell counter is a named Class II entry at 21 CFR 864.5220, and the differential counter sits in the same entry.
How does Canada classify the same counter?
Canada regulates it as an in vitro diagnostic device. Used in diagnosis or patient management it reaches Class II through Rule 4 of Part 2 of the Medical Devices Regulations.
Does the reagent change the counter's class in Canada?
Yes, it can. Rule 7 gives an analyser and the IVDD it is used with the class of the higher-risk device, so reagents carrying a higher class lift the counter with them.
What makes the class move to Class III?
Two paths. A high-risk purpose under Rule 4, such as cancer screening or genetic testing, or use outside a laboratory, because a near patient IVDD is Class III under Rule 6.
Is quality-control material part of the counter?
No. Quality-control material is a separate IVDD with its own class, and it is filed separately in both countries.
What does the class change for a supplier?
A Class II IVDD sold in Canada needs a licence supported by a quality-system certificate against ISO 13485, and a Class III device carries a heavier application with review of the performance evidence.
0 comments