Blood Agar in Canada vs the US: Which Media Rules Apply?

Quick facts

• United States: a culture medium is a device, and the code splits it into several entries. 21 CFR 866.2320 covers a differential culture medium at Class I, identified by a visible change such as a colour change in a specific biochemical component.
• United States: the added blood is reached separately. 21 CFR 866.2450 covers a supplement for culture media at Class I, described as an additive such as a vitamin or sugar mixture used to enhance the growth of fastidious microorganisms with complex nutritional requirements.
• United States: the transport and incubation stages have their own entries. 21 CFR 866.2390 covers a transport culture medium and 21 CFR 866.2540 covers a microbiological incubator, both Class I.
• Canada: culture media are in vitro diagnostic devices, not general medical devices, and they are classified under Part 2 of Schedule 1 to the Medical Devices Regulations, SOR/98-282.
• Canada: the medium is named in exactly one place. The table to Rule 9 of the IVD rules sets "microbiological media used to identify or infer the identity of a microorganism" and "IVDD used to identify or infer the identity of a cultured microorganism" at Class I.
• Canadian regulation text used here is current to 2026-09-21 and last amended 2026-06-17, as stated on the official consolidation.

A blood agar plate looks like the simplest object on a microbiology bench: a dish, a basal medium and an added blood product. Underneath it sit four American entries, a Canadian route that runs through the in vitro diagnostic rules rather than the device rules, and a boundary that changes the class when the plate is used outside a laboratory. This article sets out both routes and the boundary between them.

What class is a culture medium in each country?

In the United States, the medium is a device and the code sorts it by function. Section 866.2320 describes a differential culture medium as a device that consists primarily of liquid biological materials intended for medical purposes to cultivate and identify different types of pathogenic microorganisms, with identification accomplished by the addition of a specific biochemical component that produces a visible change. It places the device in Class I, general controls, exempt from premarket notification subject to the limitations in 21 CFR 866.9.

The blood in blood agar is reached through a different paragraph. Section 866.2450 describes a supplement for culture media as a device, such as a vitamin or sugar mixture, added to a solid or liquid basal medium to produce a desired formulation and intended to enhance the growth of fastidious microorganisms. It is also Class I.

That split is worth understanding, because it means a laboratory buys one product whose regulatory identity is a composite. The base is a medium; the enrichment is a supplement; the plate travelled from the collection site as a transport medium under 866.2390; and the plate was incubated in an incubator under 866.2540. Four Class I entries describe one workflow.

Canada does not classify culture media as ordinary medical devices. Schedule 1 to the Medical Devices Regulations has a separate part for in vitro diagnostic devices, and culture media fall inside it. Rule 8 of that part is a residual rule: if Rules 1 to 7 do not apply, all other IVDDs are classified as Class I. Rule 9 then names specific media and sets their class in a table.

Item	Canada	United States
Framework used	Part 2 of Schedule 1, in vitro diagnostic devices	Part 866, microbiology devices
Named entry for a culture medium	Rule 9 table, microbiological media, Class I	866.2320, differential culture medium, Class I
Enrichment added to a basal medium	Included in the IVDD analysis	866.2450, supplement for culture media, Class I
Transport medium	IVDD, Rule 8 residual, Class I	866.2390, Class I
Incubation equipment	Active device rules if powered	866.2540, Class I
Class changes with setting	Yes: Rule 6, near patient use, Class III	No: the entry governs

How do the American and Canadian media rules differ?

The two systems agree on the destination and disagree about which rule book gets there.

In the United States, everything about the plate is in one part of the device regulations. The medium, the supplement, the transport medium and the incubator each have a section, all at Class I, and the buyer's task is to match the product to the entry that describes its function. Nothing about the plate changes when it is used in a hospital laboratory instead of a physician's office, because the entry describes the device and not the setting.

In Canada, the plate is an in vitro diagnostic device and the general device rules do not reach it. Rule 6 of the IVD rules states that a near patient IVDD is classified as Class III, and a near patient IVDD is defined as one intended for use outside a laboratory, for testing at home or at the point of care such as a pharmacy, a health care professional's office or the bedside. A laboratory bench plate is not near patient use, so Rule 6 does not apply to it, and the plate rests on Rule 8 and the Rule 9 table at Class I.

That boundary is the practical difference. In Canada the class of a microbiological medium can move from Class I to Class III by reason of where it is used, and the deciding document is the intended use statement on the labelling rather than the formulation in the dish.

The second Canadian structure to know is Rule 7: where an IVDD, including its analyzers, reagents and software, is intended to be used with another IVDD, the class of both is that of the higher risk device. A medium, a reagent and a reader used as one system therefore share the higher class.

Product form	United States	Canada
Blood agar plate, laboratory use	866.2320 with 866.2450, Class I	IVDD, Rule 8 residual and Rule 9 table, Class I
Transport medium	866.2390, Class I	IVDD, Rule 8 residual, Class I
Medium used at the point of care	Same entry; Class I	Rule 6, near patient IVDD, Class III
Medium used with a second IVDD	Entry governs; no combination rule of this kind	Rule 7, both take the higher risk class
Incubator	866.2540, Class I	Depends on whether the unit is powered and on the applicable rules
Specimen collection and transport device	866.2900, Class I	IVDD rules apply to the diagnostic component

Which quality standard applies to a culture medium?

ISO 11133:2014 is the standard for the quality assurance of culture media, and it is the instrument that turns a formulation into a controlled product.

The standard defines terms related to quality assurance of culture media and specifies requirements for the preparation of culture media intended for microbiological analysis of food, animal feed, samples from the food or feed production environment and water intended for consumption or used in food production. It states that the requirements are applicable to all categories of culture media prepared for use in laboratories performing microbiological analyses.

For a clinical laboratory, the second instrument is ISO 15189:2022, which specifies requirements for quality and competence in medical laboratories and states that it is applicable to point-of-care testing as well. Between them, the two standards cover the medium and the laboratory that uses it, and neither of them decides the device class, which is settled by the American entries and the Canadian IVD rules.

What should a laboratory hold for a blood agar line?

Six records, and the first three are what an assessor asks for.

• The medium specification. The formulation, the enrichment and the sterility or performance claim on the label, because the American identity of the product depends on which function it serves.
• The quality control record. The organisms used to check that the plate supports growth and shows the expected reaction, and the lot each check was run on.
• The storage and expiry record. The temperature band and the date the plate left it, since the plate's shelf life is short and the record is the only evidence of it.
• The incubator record. The set temperature, the tolerance and the monitoring schedule for the unit named in 866.2540 or reached by the Canadian active device rules.
• The intended use statement. Where the medium is used, since in Canada that statement is what separates a Class I laboratory plate from a Class III near patient test.
• The combination record. Where the medium is used with a reader or another IVDD, the higher class the combination takes in Canada under Rule 7.

Which consumables does a microbiology bench restock with its media?

A microbiology bench is stocked as a chain from collection to reading. For laboratories buying at case level, the wholesale ordering page sets out account and case terms and the B2B wholesale collection lists the lines held for institutional buyers. The foam tipped oral swabsticks cover specimen collection, the transport bags cover the move to the bench, and the sterile Petri dishes cover the plate itself. Laboratories that also run a sterilizer can pair the monitoring collection with the biological indicator 5-pack trial.

Sources

1. 21 CFR 866.2320, differential culture medium
2. 21 CFR 866.2450, supplement for culture media
3. 21 CFR 866.2390, transport culture medium
4. 21 CFR 866.2540, microbiological incubator
5. 21 CFR 866.2900, microbiological specimen collection and transport device
6. 21 CFR 866.9, limitations of exemptions
7. Medical Devices Regulations, SOR/98-282, full text and Schedule 1
8. ISO 11133:2014, quality assurance of culture media
9. ISO 15189:2022, medical laboratories, requirements for quality and competence
10. ISO 14971:2019, risk management of medical devices
11. ISO 13485:2016, medical device quality management systems
12. CLSI standards and products
13. Public Health Ontario, laboratory services test information index
14. Public Health Ontario, specimen acceptance criteria
15. openFDA device classification API
16. FDA device classification database
17. Health Canada, medical devices
18. College of Medical Laboratory Technologists of Ontario
19. Institute for Quality Management in Healthcare
20. WHO laboratory biosafety manual

Print-ready companion: the free sterilization log sheet gives the cycle behind a prepared medium batch a dated home, and it prints with no account and no email.

Poured in batches? The sterilization log generator prints one row per load, so the cycle that sterilised a medium stays attached to the batch it produced.

Not sure how this applies to your own setup? Ask a compliance specialist — you’ll get a written answer specific to your equipment and province, with the regulation or standard it is based on cited.

Related reading

• Agar and Petri Dishes: Agar Types, Prepared Plates and Storage
• Microbiology Culture Swabs: Types and Transport for Canadian Labs
• Microbiological Monitoring for Labs and Food Manufacturing

CliniEco Medical supplies laboratory, eye care and clinic consumables of the kind described in this article. MDEL #35334. This article is written for laboratory, quality and procurement professionals and is not clinical or regulatory guidance; the choice of medium, the quality control organisms and the classification decision belong to the laboratory's quality system and to the requirements that apply to it.

Frequently Asked Questions

What class is a differential culture medium in the United States?

Class I, general controls, under 21 CFR 866.2320, exempt from premarket notification subject to the limitations in 21 CFR 866.9. The section describes a medium intended to cultivate and identify pathogenic microorganisms through a visible change in a specific biochemical component.

What about the blood added to the agar base?

It is reached through 21 CFR 866.2450, supplement for culture media, at Class I. The section describes an additive such as a vitamin or sugar mixture added to a basal medium to enhance the growth of fastidious microorganisms.

How does Canada classify a culture medium?

As an in vitro diagnostic device under Part 2 of Schedule 1 to the Medical Devices Regulations. Rule 8 is the residual rule at Class I, and the table to Rule 9 names microbiological media used to identify or infer the identity of a microorganism at Class I.

When does a culture medium become Class III in Canada?

When it is a near patient IVDD. Rule 6 states that a near patient IVDD is classified as Class III, and near patient means intended for use outside a laboratory, at home or at the point of care such as a pharmacy, a physician's office or the bedside.

Does the class of a medium change with the laboratory setting in the United States?

No. The American entries describe the device and its function, so a differential culture medium remains Class I whether it is used in a hospital laboratory or a smaller setting, unless the product itself is promoted differently.

What standards cover a blood agar plate?

ISO 11133:2014 covers the quality assurance and preparation of culture media for microbiological analysis, and ISO 15189:2022 covers the quality and competence requirements of the medical laboratory that uses them. Neither standard decides the device class.