FIT
Also written as: FIT — fecal immunochemical test
Fecal immunochemical test; a stool-based screening method for colorectal cancer that detects hidden blood.
Full Definition
The fecal immunochemical test (FIT) is a non-invasive screening method for colorectal cancer that uses antibodies to detect human hemoglobin in stool samples. Unlike the guaiac-based fecal occult blood test, FIT specifically detects lower gastrointestinal bleeding and does not require dietary restrictions before testing. The test is typically performed annually and can be done at home, making it a convenient screening option that has shown effectiveness in reducing colorectal cancer mortality when used in organized screening programs.
Usage
Usage note: Write as 'FIT' in capitals. Not to be confused with FOBT (fecal occult blood test), which is a broader category.
In Context
- "The patient returned a positive FIT result, requiring follow-up colonoscopy." — Clinical note
- "FIT testing should be offered annually to average-risk individuals aged 50-75." — Screening protocol