Fecal Occult Blood

Optimal result: 0 – 10 mcg/g

Blood in the stool is a sign of bleeding in the digestive tract. This could indicate cancer, polyps, hemorrhoids, diverticulosis, or inflammatory bowel disease, also called colitis.

– Assess for cause of bleeding (i.e., Ulcers, polyps, diverticulitis, IBD, colorectal cancer, etc.)

– One positive test warrants further investigation. The fecal occult blood test can only detect the presence or absence of blood — it doesn’t indicate potential sources of bleeding.

– Occult blood in the stool may indicate colon cancer or polyps in the colon or rectum, though not all cancers or polyps bleed.

– Your test could show a positive result when you have no cancer (false-positive result) if you have bleeding from other sources, such as a stomach ulcer, hemorrhoid, or even blood swallowed from your mouth or your nose.

– You may need additional testing, such as a colonoscopy, to locate the source of the bleeding.

Fecal occult blood testing (FOBT) checks stool samples for hidden (occult) blood loss from the mouth to the colon.

Fecal occult blood testing (FOBT) checks stool samples for hidden (occult) blood loss from the mouth to the colon. A positive result indicates either upper gastrointestinal bleeding or lower gastrointestinal bleeding. The test does not directly detect colon cancer but is often used in clinical screening for that disease. It can also be used in early diagnosis of active occult blood loss in anemia or other gastrointestinal symptoms.

Fecal Occult Blood
Healthmatters dashboard showing biomarker trend graph

Every lab result you’ve ever had, charted and explained.

Healthmatters is a tracker for your lab results. Upload a report from any lab, any country — every marker charted and explained.

Start with my report →
Beyond Fecal Occult Blood — 10,000+ markers explained
One Fecal Occult Blood result tells you where you are. Your history tells you where you’re heading. Upload your past lab reports and see this marker — and every marker on them —every marker charted against your own lab’s ranges.
Start with this report →
Healthmatters timeline preview showing biomarker trends over time
Clinical Sources & References

All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.

Article Review Log
Written by Healthmatters Editorial Team
Healthmatters Lifetime Plan

Pay $250. Track your health forever

One payment. No renewals. Yours for life.

10,000+ biomarkers explained · trends over time

See other plans →
Secure checkout via Stripe · GDPR & HIPAA
We accept results from any lab
LabCorp Quest Diagnostics Genova Diagnostics DUTCH Test Doctor's Data Vibrant America ZRT Laboratory Cyrex Labs + any other lab

What members are saying

★★★★★ 10,000+ happy members
★★★★★

"Watching my numbers move over the years — instead of forgetting last time's results — completely changed how I manage my health."

Daniel
Member since 2022
★★★★★

"Living across several countries made keeping my lab results organized a real challenge. Healthmatters brought my results from the USA, Spain, and Germany together — 20 years of history, with long-term trends instead of scattered reports."

Ben
Member since 2021 · tracks across countries
★★★★★

"Standard lab ranges are too wide for how I practice — 'normal' isn't optimal. I set my own bands, so a client sees yellow before a marker goes officially out of range. That's the conversation I want to be having."

Dr. Alexandra
Functional medicine · 6 yrs on Pro