Stool Occult Blood
Also known as: FOBT, Fecal Occult Blood Test
Think of this as a metal detector for hidden bleeding. A positive beep does not say what or where — most causes are benign — but it earns a proper look, often with colonoscopy.
What this test means
Occult means hidden. This test finds tiny amounts of blood in stool that may come from anywhere in the digestive tract — ulcers, piles, polyps, or rarely growths.
Why it is done
It is done for unexplained anemia, screening for bowel problems after age 45–50, and evaluating abdominal symptoms.
Understanding your value
A positive result means blood is present somewhere in the gut — common causes include piles and ulcers, but doctors may advise colonoscopy to be thorough.
A negative result is reassuring, though screening may still be repeated periodically as advised.
Reported simply as positive or negative. Certain foods and medicines can affect some test versions — follow the lab's preparation instructions.
Always discuss a positive result with your doctor. Seek care promptly for visible blood in stool, black tarry stools, or worsening weakness.