Laboratory documents
How to verify that a cell product was tested for sterility
Sterility is the one release test where the honest answer involves a timing problem — and how a clinic explains that problem tells you most of what you need to know.
- Medically reviewed by:
- Prof. Dr. Erdal Karaöz Team
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The short answer
Compendial sterility testing under USP <71> or Ph. Eur. 2.6.1 requires a 14-day incubation. Many cell products are administered before that finishes, so responsible facilities run a validated rapid method or in-process Gram stain at release, complete the compendial test afterwards, and have a written procedure for contacting the patient and the treating physician if it later fails. Ask which method, which timepoint, and what happens if the final result is positive.
How to verify it, step by step
These steps work at any clinic, anywhere. Nothing here depends on choosing us.
- Ask which sterility method is used and whether it is the compendial 14-day test, a validated rapid microbiological method, or both.
- Ask what result is available at the moment of administration, and what is still incubating.
- Ask about endotoxin testing, which is fast and should always be available before release, with a stated limit.
- Ask about environmental monitoring of the cleanroom: how often, and what happens after an excursion.
- Ask for the written procedure covering a positive sterility result after administration — who is contacted, how quickly, and what treatment is offered.
- Check the dates on the CoA against the date of your infusion or injection.
What good looks like, and what should worry you
| What you are checking | An acceptable answer | A red flag |
|---|---|---|
| Method | USP <71> / Ph. Eur. 2.6.1, plus a validated rapid method | 'Sterile' asserted with no method |
| Timing | Clear statement of what is known at release | Implying full sterility results exist when they cannot yet |
| Endotoxin | Quantified against a stated limit | Not tested or not mentioned |
| Environment | Routine cleanroom monitoring with trending | No environmental data |
| Failure plan | A written patient-notification procedure | 'That has never happened' |
| Documentation | Dated results on your batch CoA | Verbal reassurance only |
How we grade claims like these: How we evaluate evidence · Editorial standards · Conflict-of-interest disclosure.
Documents to request in writing
Ask by email so the answer is documented. A clinic that cannot send these before payment is telling you something.
- The sterility method and the result status at the time of your treatment
- The endotoxin result and its limit
- The cleanroom classification and monitoring summary
- The written procedure for a post-administration positive result
Do not write it yourself: copy our ready-made email and WhatsApp request.
Frequently asked questions
Related verification guides
- How to verify mycoplasma testing
- How to read a Certificate of Analysis
- How MSC products are tested
- The full verification hub
Use this on us too
Send these questions to us exactly as written. We answer them with documents, and if something does not apply to your case we say so.