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Endoscopic Fecal Immunochemical Test for Occult Blood (FIT) Stool Sample

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

This test detects hidden (occult) blood in your stool using a simple, painless sample collected during an endoscopy procedure.

Quick summary

["A FIT helps screen for early signs of gastrointestinal bleeding or conditions like colorectal cancer."]

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

Key facts at a glance

LOINC
111944-5
Short code
Endosc find Stom Endscpy
Synonyms
Endosc find Stom 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

How the Test Works

During your endoscopy, a small sample of stool is collected from your colon. This sample is then tested for the presence of hidden blood, which may indicate bleeding in your digestive tract.

What to Expect Before the Test

No special preparation is needed for this test, as it is performed during the endoscopy itself. You may feel some discomfort during the procedure, but it is generally well-tolerated.

Common Uses

This test is often used as part of a screening process for colorectal cancer or to investigate symptoms like unexplained weight loss, changes in bowel habits, or persistent abdominal pain.

What the Results Might Indicate

Positive results suggest the presence of hidden blood, which could signal conditions like bleeding ulcers, polyps, or colorectal cancer. Further evaluation, such as additional imaging or biopsies, may be needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

FIT Stool Test

Frequently asked questions

Why did my doctor order this test?
Your doctor may recommend this test if you have risk factors for colorectal cancer, such as a family history, age over 50, or symptoms like unexplained bleeding or changes in bowel habits.
What does a positive result mean?
A positive result means hidden blood was found in your stool. This does not mean you have cancer, but it will prompt further testing to investigate potential causes.
How often should I get this test?
If you are at average risk for colorectal cancer, most guidelines recommend this screening test every 1–3 years, depending on your age and health status.
  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