Health Knowledge Hub
How at-home testing works
Home screening kits let you collect a sample privately and read a result, followed by clinical confirmation where needed.
CareFree Kits is a private service and is not affiliated with or operated by the NHS.
The basic process
Most rapid home kits follow the same pattern: prepare the kit, collect the sample type specified in its instructions (for example urine, a swab or a finger-prick blood drop), add it to the test device and read the result after the stated time.
Each test is different. Always follow the instructions for the exact kit you have, including sample amounts and reading times.
Things that affect a result
Using the wrong sample, reading too early or too late, storing the kit outside its temperature range or testing too soon after exposure can all affect a result.
What home testing cannot do
A home screening test is not a diagnosis and does not replace a clinical assessment. It cannot treat an infection. If you have symptoms or a positive or unclear result, contact a GP, pharmacist or sexual health clinic.
Related on CareFree Kits
Sources
- NHS – Sexually transmitted infections (STIs) (nhs.uk/conditions/sexually-transmitted-infections)
Last reviewed 5 November 2026. This guide has not been clinically reviewed by a named professional.