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Frequently Asked Questions

What is an assay?

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!)

Why do you need to know the purity of my test item?

Noting the purity of the item being tested is part of our GLP (Good Laboratory Practice) compliance. For certain tests, it allows us to ensure the correct concentration is being tested. It’s also another piece of key information that we check to make sure we have the right test item, and you get the right result.

Is XCellR8 GLP accredited?

Yes we are. Our Good Laboratory Practice (GLP) accreditation by the UK’s MHRA (Medicines and Healthcare Products Regulatory Agency) means that we can provide you with in vitro safety test data that can be used for compliance with a wide range of European and global regulations.

What units is antioxidant activity measured in for this assay?

XCellR8’s antioxidant test uses the OxiSelect™ method. The test is based on the intracellular conversion of DCFH to its fluorescentmetabolite (DCF). The reaction is inhibited by anti-oxidants, reducing the amount of fluorescence observed and so the test measures fluorescent intensity. You can read more information about OxiSelect™ here.

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.

When will I receive my final report?

Most of our tests take 6-8 weeks from receipt of your sample to the first draft report, although please note sometimes it can be slightly shorter or longer depending on the test. We ask for your comments on the draft report within a week, and your final report will be with you after we’ve then completed our final QA checks.