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Fecal Immunochemical Test for Hematochezia (FIT-Hemoglobin) – Quantitative Stool Test

Published: August 9, 2026Updated: August 16, 2026

This test measures hidden (occult) blood in your stool, which may indicate bleeding in your digestive tract.

Quick summary

["Helps detect early signs of gastrointestinal bleeding that you might not notice."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
97617-5
Short code
E faecalis DNA Snv Ql NAA+n-prb
Synonyms
E faecalis DNA Snv Ql NAA+n-prb
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-probe-amp-tar
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may recommend this test if you have symptoms like unexplained weight loss, fatigue, or changes in bowel habits, or if you’ve had recent trauma or surgery that could cause bleeding. It’s also used as a screening tool in certain high-risk groups.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications (like blood thinners) or foods that could interfere with results (such as red meat or vitamin C supplements) for 2–3 days before testing.

What Happens During the Test

You’ll collect a small stool sample in a provided container. The sample is then analyzed in a lab to detect hidden blood, typically using a chemical reaction that turns a color change if blood is present.

What the Results Mean

Results are usually reported as a positive or negative for occult blood. A positive result suggests further evaluation (like an endoscopy) is needed to find the source of bleeding.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for identifying gastrointestinal bleeding that may not be visible to the naked eye. Early detection can prevent complications like anemia or severe dehydration and guide treatment decisions.

Short name

FIT (Quantitative Hemoglobin)

Frequently asked questions

What causes false positives in this test?
False positives can occur due to dietary factors (e.g., eating raw vegetables, taking NSAIDs, or consuming certain supplements), recent trauma, or hemorrhoids. If results are positive, your doctor will likely order additional tests.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times.
Can I eat or drink anything before this test?
Yes, you can eat and drink normally, but avoid high-risk foods or supplements that might interfere with the test results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy