How samples are collected for genetic testing

What sample is needed for a genetic test?

Most genetic tests require either a small blood sample or a saliva sample taken from inside your cheek. Both options provide enough DNA for analysis and are generally quick and well tolerated.

Your care team will confirm which type of sample is required for your specific test.

Where is the sample collected?

Samples are usually collected in a clinical setting such as a GP practice, hospital, clinic, or dedicated blood collection point. Your healthcare provider will tell you where to go based on your location and the type of test.

Do I need to prepare for sample collection?

In most cases, no special preparation is needed before providing a blood or saliva sample. If any preparation is required, such as fasting, your healthcare team will inform you in advance.

What happens after the sample is collected?

After collection, your sample is labelled with your details and prepared for transport. It is then securely shipped to one of , following procedures designed to maintain sample quality, traceability, and accurate identification.

How is the sample analysed?

Once your sample arrives at the laboratory, DNA is extracted from your cells and prepared for analysis. Our modern genetic laboratories use such as next-generation sequencing (NGS), which allows large amounts of DNA to be analysed quickly and accurately.

The analysed DNA is compared with a reference sequence to identify genetic variants that may be relevant to your test.

Why laboratory quality matters

The accuracy of genetic testing depends on the quality standards followed by the laboratory. use validated methods, controlled processes, and up-to-date scientific guidelines to ensure reliable and clinically meaningful results.

When testing is performed under these conditions, you and your healthcare provider can have confidence in the findings.

If you feel worried about sample collection

It is normal to have questions or feel uncertain before giving a sample. Sample collection is usually quick and routine, and your care team can explain each step and help address any concerns you may have beforehand.