Quick facts
- An anaerobic culture system is the set of equipment and media used to isolate and grow microorganisms that die in the presence of oxygen, and it includes the chamber, the transport medium and the jar or pouch that holds the reduced atmosphere.
- United States: the chamber has a named entry at 21 CFR 866.2120, placed in Class I and exempt from premarket notification; anaerobic transport media are reached through 21 CFR 866.2390, and a microbiological specimen collection and transport device through 21 CFR 866.2900.
- Canada: the Medical Devices Regulations, SOR/98-282 names no chamber, and reaches Class I through Rule 7(1) of Schedule 1 for a non-invasive device, with anaerobic transport media reached as an in vitro diagnostic device under Rule 8 of Part 2.
- The result is the same class by two paths: the United States names the product, and Canada names the rule.
- The step that decides the reading is the moment the specimen meets the reduced atmosphere, not the moment the plate is incubated, so the transport medium and the chamber have to be treated as one system.
- The entries and rule text below were checked against the current CFR text and the Regulations on 2026-10-08.
An anaerobic culture system is what a microbiology laboratory reaches for when the organism it is looking for will not survive the trip through air. The specimen is collected into a medium that holds the oxygen away, carried to the bench, and placed in a chamber or a jar that keeps the atmosphere reduced while the colonies grow. Each part of that chain is a small purchase, and the chain only works if the parts are matched. This article explains what the system does, how each country files its parts, and what a laboratory should be able to point at when the parts are ordered.
What does an anaerobic culture system do?
The system removes oxygen from the space around the specimen and keeps it out. A chamber holds a reduced atmosphere and lets a person work inside it through gloves or ports, a jar or pouch holds a small number of plates in a reduced atmosphere produced by a gas pack or an evacuation step, and a transport medium carries the specimen from the ward to the bench without oxygen reaching it. The colonies that grow are the ones that could not have grown in air, and the reading depends on the atmosphere having stayed reduced for the whole path.
That path is why the system is treated as a set. A plate that is placed in a good chamber after travelling in a medium that let oxygen in has already lost the organism the laboratory was looking for.
How does the United States file the parts?
In the United States the chamber is reached by a named entry. 21 CFR 866.2120 identifies an anaerobic chamber as a device intended to maintain an oxygen-free environment and to isolate and cultivate anaerobic microorganisms, places it in Class I, and exempts it from premarket notification. The transport side sits next to it: 21 CFR 866.2390 covers culture media for anaerobic transport, and 21 CFR 866.2900 covers a microbiological specimen collection and transport device intended to preserve the viability or integrity of microorganisms during transport.
| Part of the system | United States entry | Class |
|---|---|---|
| Anaerobic chamber | 866.2120 | Class I |
| Anaerobic transport medium | 866.2390 | Class I |
| Specimen transport device | 866.2900 | Class I |
| Anaerobic box glove | 866.2120 | Class I |
A laboratory that buys the parts separately should still describe them as one system, because a certificate that covers the chamber says nothing about the medium that carried the specimen to it.
Why does Canada reach Class I by rule?
Canada classifies the chamber and the transport medium through the general rules in Schedule 1 rather than through named entries. A chamber is a non-invasive device and Rule 7(1) puts all other non-invasive devices in Class I. A transport medium that is used to preserve a specimen is an in vitro diagnostic device, and Rule 8 of Part 2 puts every IVDD not caught by the earlier rules in Class I. Nothing in the rules lifts an anaerobic system to a higher class, because it neither detects a transmissible agent for transfusion screening nor makes a patient-management claim that could put a patient in danger if the result were wrong.
| Item | Canada | United States |
|---|---|---|
| Named entry | No entry names an anaerobic chamber | 21 CFR 866.2120 |
| Class | Class I, by Rule 7(1); media by Rule 8 | Class I |
| Basis of the class | The rule that catches other non-invasive devices and other IVDDs | The named entry each part is filed under |
| Premarket route | Establishment licence; a Class I device does not get a licence of its own | Exempt from premarket notification |
| Quality system | The manufacturer keeps the records the Regulations require | Quality system for the chamber, as the entry allows |
The two countries agree on the class and disagree on how they get there. A buyer who asks a supplier for a United States entry and a Canadian rule reference can reconcile the two answers, because both describe the same part through different paperwork.
What should a laboratory check on an anaerobic system?
The class says how the parts are regulated; the practical questions are about whether the atmosphere actually stayed reduced. A laboratory should be able to show what medium the specimen travelled in, how the atmosphere was produced, and what indicator confirmed that the atmosphere was reduced.
| Element | What to check | Why it matters to the reading |
|---|---|---|
| Transport medium | That it is the medium the collection protocol names | The wrong medium lets oxygen in before the bench |
| Atmosphere method | Gas pack, evacuation or chamber, matched to the volume | An under-sized method leaves oxygen in the jar |
| Indicator | That an anaerobic indicator is present and read | The indicator is the evidence the atmosphere was reduced |
| Chamber integrity | Gloves, seals and airflow where a chamber is used | A worn glove breaks the atmosphere a person is working inside |
| Records | ISO 15189:2022 for the laboratory | The reading is only comparable if the basis is known |
A laboratory that records the medium, the method and the indicator can defend a negative result, because it can show that the organism was not there rather than that the atmosphere failed.
What does a laboratory restock around the anaerobic bench?
An anaerobic bench is stocked as a set. The laboratory consumables collection gathers the bench lines a culture room draws on, and the sterile 120 mL specimen container carries a specimen without leaking before it reaches the bench. Clinics that also monitor their own steriliser pair the sterilization monitoring collection with the 24-hour biological indicator 50-pack. 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.
Sources
- 21 CFR 866.2120, anaerobic chamber
- 21 CFR 866.2390, culture media for anaerobic transport
- 21 CFR 866.2900, microbiological specimen collection and transport device
- openFDA device classification API
- Medical Devices Regulations, SOR/98-282, full text and Schedule 1
- Health Canada, medical devices
- ISO 15189:2022, medical laboratories, requirements for quality and competence
- ISO 13485:2016, medical devices quality management
- ISO 14971:2019, risk management of medical devices
- CLSI, clinical and laboratory standards
- Public Health Ontario, laboratory services
- US CDC, laboratory safety
- US FDA, medical devices
- World Health Organization, laboratory biosafety manual
- Standards Council of Canada
- CCOHS, OSH answers
- US OSHA, laboratory safety
- Public Health Agency of Canada, Canadian Biosafety Standard
Keeping the atmosphere record
A negative anaerobic culture is only as strong as the record that shows the atmosphere was reduced. The printable anaerobic culture log is a blank sheet with columns for the specimen, the transport medium, the atmosphere method, the indicator, the incubation dates and the reader, so a list is available when a result is questioned. The culture log generator on the same page sizes the form to the number of benches a laboratory runs.
Every bench and every protocol differs. 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
- Dye and chemical stains in Canada vs the US: which class
- Chocolate agar in Canada vs the US: which media rules
- Specimen acceptance criteria in Canada vs the US: which rules
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 laboratory belong to the manufacturer and to the requirements that apply to it.
Frequently Asked Questions
Is an anaerobic chamber a regulated medical device?
Yes, in the United States, where it is a named Class I device at 21 CFR 866.2120, exempt from premarket notification. In Canada it is a non-invasive device that reaches Class I through Rule 7(1) of Schedule 1 to the Medical Devices Regulations.
How are anaerobic transport media classified?
In the United States the media are reached through 21 CFR 866.2390 and the specimen transport device through 866.2900, both at Class I. In Canada a transport medium used to preserve a specimen is an in vitro diagnostic device that reaches Class I through Rule 8 of Part 2 to Schedule 1.
Why does the system stay at Class I in both countries?
It neither detects a transmissible agent for transfusion screening nor makes a patient-management claim that could put a patient in danger if a result were wrong, so no rule lifts it. Both countries place the chamber and the transport media in Class I.
Can the parts of an anaerobic system be bought separately?
They can be bought separately, but they should be described as one system. A certificate that covers the chamber says nothing about the medium that carried the specimen to it, and the reading depends on the atmosphere having stayed reduced for the whole path.
What confirms that the atmosphere was actually reduced?
An anaerobic indicator read at the end of the incubation is the evidence, together with a record of the method used to produce the atmosphere and the volume it was sized for. Without the indicator, a negative result cannot be told apart from a failed atmosphere.
Does an anaerobic chamber need premarket notification in the United States?
No. The entry places the chamber in Class I and exempts it from premarket notification procedures.
What should a laboratory record for an anaerobic culture?
A log with columns for the specimen, the transport medium, the atmosphere method, the indicator, the incubation dates and the reader lets a laboratory defend a negative result, because it can show the organism was not there rather than that the atmosphere failed.
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