What should you know about a quantitative FIT?

FIT uses antibodies to detect human blood in stool. A quantitative version reports a measured level rather than simply saying blood was detected or not detected. The service uses its own decision threshold to determine the next step. A raised result can come from bowel polyps, irritation, haemorrhoids, or other causes as well as cancer. A lower result does not explain ongoing symptoms, so screening results must be considered with the wider clinical picture.

Use the supplied collection device and follow its instructions for sampling, labelling, storage, and return. Avoid mixing the specimen with urine or toilet water. Tell the clinician about rectal bleeding, a changed bowel habit, abdominal symptoms, anaemia, or a relevant family history. If follow-up is advised, attend it even if you feel well. This may include a [Colonoscopy](/treatments/cancer-screening/colonoscopy/), which allows direct examination and possible tissue sampling.

Arrange medical review for visible blood, persistent bowel-habit changes, ongoing abdominal discomfort, unexplained weight loss, or unusual tiredness. Seek urgent care if bleeding is heavy, stools are black and tarry, pain is severe, or you feel faint or acutely unwell. These symptoms should not wait for a routine screening result.

Ask what the reported value means in your screening service, when the result will arrive, and what follow-up is recommended. Clarify whether symptoms change the plan and whether you should continue screening if an earlier result is normal.