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Endoscopic Fecal Immunochemical Test for Hematochezia (FIT-Hemoglobin) Screening

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

This test checks for hidden blood in your stool, often done during a colonoscopy, to help detect early signs of bleeding in the digestive tract.

Quick summary

["A simple screening tool to check for hidden blood in stool, useful for early detection of gastrointestinal issues."]

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

Key facts at a glance

LOINC
111962-7
Short code
Endosc find SB Endscpy
Synonyms
Endosc find SB Endscpy
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
endoscopy
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects microscopic amounts of hemoglobin in your stool, which may indicate bleeding in the digestive tract. This is done using a specialized stool sample collected during your endoscopic procedure.

Why It’s Done

Your healthcare provider may recommend this test if you have symptoms like unexplained weight loss, persistent abdominal pain, or changes in bowel habits, or as part of routine screening for gastrointestinal bleeding.

How It’s Performed

During your colonoscopy, a small sample of stool is collected from the colon lining. This sample is then tested for the presence of hemoglobin, which helps identify potential bleeding sources.

What the Results Mean

If the test detects blood, it does not confirm a specific cause but may prompt further investigation, such as additional imaging or biopsies, to determine the source of bleeding.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is primarily a screening tool to identify potential gastrointestinal bleeding. Positive results may require further diagnostic testing to pinpoint the cause, such as polyps, ulcers, or other conditions affecting the digestive tract.

Short name

FIT Screening

Frequently asked questions

What does a positive result mean?
A positive result means hidden blood was found in your stool sample, which could suggest bleeding in your digestive system. This does not mean you have a specific disease, but it may lead to further testing to find the cause.
How often should I get this test?
Your doctor will determine how often you need this test based on your symptoms, medical history, and risk factors. Some people may get it as part of regular screening, especially if they have a family history of gastrointestinal issues.
Can I eat or drink anything before the test?
You may need to follow specific dietary instructions before your colonoscopy, but your doctor will provide detailed instructions. Generally, avoid red meat, vitamin supplements, or certain medications that could 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