10 ml if it’s a liquid or 10g if it’s a solid. This makes sure we’ve got enough of the item if you order more than one test. Please ensure your samples are clearly labelled, and match any documentation you send with them. If you don’t have this amount of your test item available, please call us to discuss your options.

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.

Broadly speaking, assay is a scientific term that means test. It is often used by the pharmaceutical industry to describe the experimental procedure that quantitatively or qualitatively measures the presence, amount, or functional activity of a target entity (to get all Wikipedia about it!)

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.

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

Please send all samples to XCellR8 (labs) Techspace One, Keckwick Lane, Daresbury, Cheshire, WA4 4AB, UK