Quick facts
- A quality control kit for culture media holds reference organisms and the checks a laboratory runs to show that a batch of medium performs as the maker intends.
- United States: the kit is reached as a quality control kit for culture media at 21 CFR 866.2480, placed in Class I; the entry states that the device is exempt from premarket notification.
- Canada: a non-invasive device intended to act as a quality control support to another medical device reaches Class II through Rule 7(2)(a) of Schedule 1 to the Medical Devices Regulations, SOR/98-282.
- The two countries differ for the kit: Class I in the United States and Class II in Canada, because the Canadian rule lifts a QC support to Class II while the US entry leaves it at Class I.
- The media the kit checks follow a separate rule, and Rule 9 of Part 2 names microbiological media used to identify a microorganism at Class I.
- The entry and rule text below were checked against the current CFR text and the Regulations on 2026-10-09.
A quality control kit for culture media is the small set of reference organisms and checks a laboratory uses to prove that a poured plate or a prepared broth is fit for the reading it is asked to give. It is not the medium itself; it is the yardstick the medium is held against. It is filed as a device in both countries, and the two rulebooks place it in different classes. This article sets out what the kit contains, how each country files it, and what a laboratory should be able to point at when a batch of medium is released and when a control fails.
What does a culture media quality control kit contain?
The kit holds the reference strains, the inoculating tools and the acceptance ranges a laboratory needs to check a batch of medium. A laboratory runs the kit against a new lot of agar or broth and compares the growth, the colour or the zone it sees with the ranges the kit states. Where the result falls inside the range, the lot is released for use; where it falls outside, the lot is held.
The kit is a support to another device rather than a diagnostic test in its own right. It produces no patient result, and its claim is that it shows whether the medium is behaving as expected. That role is the fact the rules act on in both countries, and in Canada it is the fact that lifts the kit to Class II.
How does the United States file a quality control kit?
In the United States the kit is reached by a named entry. 21 CFR 866.2480 covers a quality control kit for culture media, and the section places it in Class I. The entry states that the device is exempt from the premarket notification procedure, and a Class I device of this kind is subject to general controls.
The entry names the kit and the medium it supports, so a laboratory that buys a reference set for a medium it pours is buying the article the entry describes. The medium the kit checks sits in its own entries, which is why the kit and the plate do not share a class on one side of the border.
Why does Canada reach Class II by rule?
Canada classifies the kit through the non-invasive device rules in Schedule 1. Rule 7(1) puts all other non-invasive devices in Class I, but Rule 7(2) lifts a device to Class II where it is intended to act as a calibrator, tester or quality control support to another medical device, or where it is intended to be connected to an active device of Class II or higher. A media quality control kit is a quality control support, so it reaches Class II under Rule 7(2)(a).
The medium itself is classified separately. Under Part 2, Rule 9 carries a table, and item 3 names microbiological media used to identify or infer the identity of a microorganism at Class I. The kit and the medium it checks therefore sit in two different rules on the Canadian side, and the kit is the one that moves up.
| Item | Canada | United States |
|---|---|---|
| Class | Class II, by Rule 7(2)(a) | Class I |
| Named entry | No entry names the kit; it is a QC support | 21 CFR 866.2480 |
| Basis of the class | The rule that lifts a QC support to Class II | The named entry the kit is filed under |
| The medium it checks | Class I, by the table to Rule 9 of Part 2 | Its own medium entries |
| Premarket route | Device licence under section 32 for a Class II device | General controls, exempt from premarket notification |
| Quality system | CAN/CSA-ISO 13485 certificate behind the licence | Quality system regulation |
The two countries differ for the kit and agree that the plate is a low-risk device. A laboratory that keeps the kit's certificate of analysis with the lot it released has the document the class implies.
Which standards sit behind the kit?
The class says how the kit is regulated; the standards say how it has to behave. ISO 13485:2016 is the quality management basis behind the manufacturer's records, and ISO 14971:2019 is the risk management basis behind the design file. A laboratory that asks for those two documents is asking for the evidence behind the ranges the kit states.
| Element | What it covers | Why it matters in the plate room |
|---|---|---|
| Reference strains | The organisms the kit carries | The strains are the yardstick the lot is held against |
| Acceptance ranges | The growth or zone expected | A range off its value passes a plate that should fail |
| Storage | How the kit is kept | A kit stored warm loses the viability it depends on |
| Lot | The batch the kit came from | A shift between lots is a shift in the readings |
| Records | The QC run and its outcome | The link between a released lot and the check it passed |
| Traceability | The strain and the medium lot | The link between a control and the plate it released |
A kit that cannot show its lot and a medium lot that cannot be traced to a control run are the two gaps that meet in the same plate room.
How is a control failure worked through?
A control that fails outside its range is worked through before it is repeated. The laboratory checks the kit against its storage, checks the plate against its lot and its depth, and checks the reading against the control organism the batch was run with. The step is written down, because a failure that is recorded is a check the laboratory acted on, while a failure that is discarded is a gap in the release record.
The medium side is checked at the same time. The lot, the depth and the date are the three fields that decide whether the plate is behaving as the maker intends, and a shift in any of them is a shift in the readings rather than in the organism.
What else sits beside the kit?
The microbiology bench is stocked as a set. A sterile petri dish, 100 x 15 mm is the vessel the medium sets in, and sterile centrifuge tubes, 15 mL sit with the sample-prep lines. Clinics that monitor their own reprocessing 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 866.2480, quality control kit for culture media
- openFDA device classification API
- Medical Devices Regulations, SOR/98-282, full text and Schedule 1
- US FDA, medical devices
- US FDA, medical device databases
- US FDA, overview of device regulation
- Health Canada, medical devices
- Standards Council of Canada
- CSA Group
- ISO 13485:2016, medical devices quality management
- ISO 14971:2019, risk management of medical devices
- Clinical and Laboratory Standards Institute
- Public Health Ontario, infection prevention and control
- World Health Organization
- US CDC, laboratory quality
- CCOHS, OSH answers
A plate room is audited on the record that follows the lot. The printable media and QC log is a blank sheet with columns for the medium, the lot, the reference strain, the reading and the operator, so a released lot can be reconciled with the check it passed.
The QC log generator on the same page sizes the sheet to the number of lots and shifts a laboratory runs, so a small plate room and a regional laboratory print the form at the volumes they need.
Every laboratory and every medium 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
- Culture media, differential and selective, in Canada vs the US: which rules
- Laboratory quality control materials in Canada vs the US: which class
- Blood agar in Canada vs the US: which media 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 practice belong to the manufacturer and to the requirements that apply to it.
Frequently Asked Questions
What class is a media quality control kit in Canada?
It is a non-invasive device intended to act as a quality control support to another device, so it reaches Class II through Rule 7(2)(a) of Schedule 1.
What class is a quality control kit for culture media in the United States?
It is a named entry at 21 CFR 866.2480 in Class I, and the entry states that the device is exempt from premarket notification.
Do the two countries agree on the class?
They differ for the kit: Class I in the United States and Class II in Canada, because the Canadian rule lifts a quality control support to Class II.
Why is the kit a higher class than the plate in Canada?
The plate is a microbiological medium named in the table to Rule 9 of Part 2 at Class I, while the kit is a quality control support lifted to Class II by Rule 7(2)(a).
Does the kit produce a patient result?
No. The kit shows whether a batch of medium is behaving as expected, so it supports the medium rather than reporting on a patient.
What should a laboratory keep with a released lot?
The medium lot, the reference strain and the outcome of the QC run, kept together as a release record. That is the link between the plate and the check it passed.
What happens when a control falls outside its range?
The lot is held rather than released, and the check is repeated against the acceptance ranges the kit states before the medium is used for a reading.
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