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Frequently Asked Questions

Which skin irritation test do I need?

This depends on whether you need the test for EU regulatory purposes, in which case Skin Irritation OECD TG 439 might be right for you, providing a binary answer as to whether your item is an Irritant or Non Irritant, or for product development. Our non regulatory test uses the ET50 method and is used to place your item into a rank order of irritation potential or compare it against industry benchmarks. We’re more than happy to chat through the different test methods, or can introduce you to one of our regulatory consultancy partners who can help you make the decision.

We don’t use a Purchase Order system or else Purchase Orders take a long time to issue in my organisation. Can I still start my study?

Yes. In these circumstances, we will usually issue the invoice at the beginning of the study and ask for payment within 30 days.

Can you perform an Ames test at your laboratory?

We don’t provide the Ames test, as it uses animal components. We do provide the BlueScreen assay, a genotoxicity test that covers all types of genotoxicity: anugens, clastogens, and mutagens.

How long will my test take?

XCellR8’s tests can take as little as 4 weeks, up to a maximum of 12 weeks. We’ll always try our best to accommodate urgent requests. Please do bear in mind that the timeframe starts at the point we receive your sample and the accompanying information that we ask for in order to start a study, and finishes when we send your draft report.

Which skin sensitisation test do I need?

Current regulatory guidance for in vitro skin sensitisation testing is to adopt the “2 out of 3” approach, whereby 2 positive results out of the 3 tests (OECD TGs 442c, 442d and 442e) results in classification as a Skin Sensitiser. If you perform two of the tests and get matching results, this strategy states you can have confidence in the result without the third test. If they have different results, proceed to the third method to find a definitive result. Each of the three methods has different requirements regarding the solubility of your test item, so contact us to find out which will be best for you. You can also read more about the test methods here.

Do you offer work placements or internships?

We don’t have an internship programme at the moment but do offer occasional work placements to university students who are interested in animal-free test methods. If you would like to apply, please send your CV and a covering email explaining what our values mean to you to info@x-cellr8.com.