Occult Blood (Fecal Occult Blood/FOB)
This stool test detects hidden (occult) blood that is not visible to the naked eye. It is a key screening tool for colorectal cancer and can also indicate gastrointestinal bleeding from other sources.
- Free home collection
- Physician-reviewed report
24 Hours
Turnaround
Stool
Sample
What the Occult Blood (Fecal Occult Blood/FOB) test tells you
Blood coming from the bowel is not always visible. Small, intermittent losses from a polyp, an ulcer or an early tumour mix into the stool and change nothing you can see, yet over months they can quietly drain the body's iron stores. A faecal occult blood test looks for that hidden blood chemically, using a sample you collect at home.
The modern immunochemical version, often called FIT or iFOBT, uses antibodies that recognise human haemoglobin specifically. That specificity matters in two ways. Red meat and peroxidase-rich vegetables no longer interfere as they did with the older guaiac method, so dietary restriction is generally unnecessary. And blood from higher up the digestive tract, where haemoglobin is largely broken down before it reaches the stool, is less likely to register, which weights the test towards bleeding from the colon and rectum.
Its central role is bowel cancer screening, alongside investigating unexplained anaemia. Colon cancers usually begin as polyps that bleed occasionally long before causing symptoms, and finding them at that stage changes outcomes substantially. Two honest points follow. A positive result has many possible causes, including entirely benign ones such as haemorrhoids, and it is normally followed by direct examination of the bowel, usually colonoscopy, rather than by simply repeating the stool test. And because bleeding is intermittent, a single negative result does not exclude a source, which is why screening is repeated at the interval your doctor advises rather than done once.
Recommended as a routine colorectal cancer screening tool for adults over 45, and to investigate iron deficiency anaemia or suspected GI bleeding.
- Bowel cancer screening
The main use. It detects bleeding from polyps and early cancers at a stage when they cause no symptoms and treatment works best.
- Explaining iron deficiency
When iron stores are low without an obvious reason, slow bleeding from the gut is one of the possibilities that has to be looked for.
- A non-invasive first step
A stool sample collected at home helps identify who needs a colonoscopy, sparing the procedure for people unlikely to benefit from it.
- Investigating gut symptoms
Alongside a change in bowel habit or abdominal discomfort, it adds objective evidence of bleeding that symptoms alone cannot give.
Reasons your doctor may request the Occult Blood (Fecal Occult Blood/FOB) test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Routine bowel cancer screening
- Routine bowel cancer screening from the age your doctor recommends, repeated at the advised interval.
Anaemia & bowel symptoms
- Iron deficiency anaemia without an obvious explanation.
- A persistent change in bowel habit, or unexplained abdominal pain or weight loss.
Family history & polyp follow-up
- A family history of colorectal cancer or polyps, as part of a screening plan set by your doctor.
- Surveillance after a polyp has been removed, where your doctor includes it in follow-up.
A Positive result means human haemoglobin was detected in your stool sample: bleeding somewhere in the bowel that you cannot see. It identifies bleeding, not its cause, and most positive tests turn out to have a benign explanation such as haemorrhoids or an anal fissure. Polyps, inflammatory bowel disease, diverticular disease and ulcers linked to aspirin or anti-inflammatory painkillers can all produce one, as can menstruation or bleeding gums. A positive screen is normally followed by direct examination of the bowel, not by repeating the stool test. A Negative result means no blood was detected in that particular sample. Because bleeding from polyps and tumours comes and goes, one negative test covers one round of screening rather than settling the question, which is why it is repeated at the interval your doctor advises. Your doctor reads it with your symptoms and blood count.
Occult Blood (Fecal Occult Blood/FOB)
A Positive result means human haemoglobin was detected in your stool sample: bleeding somewhere in the bowel that you cannot see. It identifies bleeding, not its cause, and most positive tests turn out to have a benign explanation such as haemorrhoids or an anal fissure. Polyps, inflammatory bowel disease, diverticular disease and ulcers linked to aspirin or anti-inflammatory painkillers can all produce one, as can menstruation or bleeding gums. A positive screen is normally followed by direct examination of the bowel, not by repeating the stool test. A Negative result means no blood was detected in that particular sample. Because bleeding from polyps and tumours comes and goes, one negative test covers one round of screening rather than settling the question, which is why it is repeated at the interval your doctor advises. Your doctor reads it with your symptoms and blood count.
No blood detected in the sample.
Blood detected: further evaluation is usually advised. Consult your physician.
This test is reported descriptively rather than on a numeric scale: each finding below explains what your report may say.
This information is for general education only and is not medical advice. Reference ranges can vary by laboratory, age, sex, and individual factors. Always consult your physician or doctor to interpret your results.
What a higher result can point to
- Colorectal polyps, which commonly bleed on and off long before causing symptoms.
- Colorectal cancer, including early lesions that produce no symptoms at all.
- Haemorrhoids and anal fissures, among the commonest and most benign reasons for a positive result.
- Inflammatory bowel disease, diverticular disease, or infectious colitis.
- Ulcers or erosions in the stomach and small bowel, particularly with anti-inflammatory painkillers or aspirin.
- Blood entering the sample from menstruation, or from bleeding gums or nose.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.
What this test cannot tell you
- A positive result identifies bleeding, not its cause, and most positive tests turn out to be due to benign conditions such as haemorrhoids.
- Bleeding from polyps and tumours is intermittent, so a single negative test does not exclude one, which is why screening is repeated at intervals.
- Immunochemical tests target human haemoglobin from the lower bowel and are less sensitive to bleeding from the stomach and upper small intestine.
- A negative result carries no meaning beyond the absence of detectable blood in that particular sample.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1The test finds blood you cannot see; it does not find cancer directly.
- 2A positive result is normally followed by direct examination of the bowel, usually colonoscopy, not by repeating the stool test.
- 3Most positive results turn out to have a benign cause, most often haemorrhoids.
- 4Bleeding comes and goes, so one negative test covers one round of screening rather than settling the question for good.
- 5Immunochemical versions recognise human haemoglobin specifically, so dietary restriction is generally not required.
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Frequently Asked Questions
Everything you need to know about the Occult Blood (Fecal Occult Blood/FOB) test. Can't find what you're looking for?
Talk to our team→No. It means blood was detected in the sample. Haemorrhoids, fissures, polyps, inflammation and ulcers all produce the same finding, and benign causes are far more common than cancer. It does mean the source needs to be identified, and your doctor will usually arrange a colonoscopy to look directly.
Not for the immunochemical test used today, which recognises human haemoglobin specifically and ignores blood or plant peroxidases from food. The older guaiac method did require avoiding red meat and certain vegetables, so check which test you are having if you are unsure.
Less reliably. Haemoglobin from the stomach and upper small bowel is largely digested before it reaches the stool, so immunochemical tests are weighted towards bleeding from the colon and rectum. Bleeding higher up is usually investigated in other ways, such as gastroscopy.
For this round it is reassuring, but not permanently. Polyps and tumours bleed on and off rather than constantly, so a single sample can miss one that is present. That is exactly why screening is repeated at set intervals rather than done once.
This stool test detects hidden (occult) blood that is not visible to the naked eye. It is a key screening tool for colorectal cancer and can also indicate gastrointestinal bleeding from other sources.
Recommended as a routine colorectal cancer screening tool for adults over 45, and to investigate iron deficiency anaemia or suspected GI bleeding.
No, fasting is not required for the Hidden Blood in Stool test, so you can eat and drink normally beforehand.
The Hidden Blood in Stool test uses a stool sample that you collect yourself in the container provided: no needle is involved.
Results for the Hidden Blood in Stool test are typically ready within 24 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The Hidden Blood in Stool test is AED 80, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by all ages. If you are not sure it is right for you, our care team is happy to advise.
Add the Hidden Blood in Stool test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review: just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.