Fecal Immunochemical Test for Occult Blood (FIT) – DNA-Based Probe
This test detects hidden blood in your stool using a specialized DNA-based probe to help identify potential gastrointestinal bleeding.
["A simple stool test to check for hidden blood, often used to screen for colorectal issues."]
Key facts at a glance
- LOINC
- 92783-0
- Short code
- E faecalis DNA Bld Pos Ql NAA+probe
- Synonyms
- E faecalis DNA Bld Pos Ql NAA+probe
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters
Hidden blood in stool (occult blood) can sometimes signal conditions like colorectal cancer, hemorrhoids, or other gastrointestinal problems. This test helps doctors identify if further evaluation is needed without requiring a traditional stool sample collection.
How the Test Works
The test uses a DNA-based probe to detect specific markers in your stool. Unlike traditional chemical tests, this method is more sensitive and specific, helping to catch blood at very low levels that might otherwise go undetected.
What to Expect Before the Test
No special preparation is required. You’ll provide a small sample of stool during your visit, and the test will be processed immediately. Avoid using over-the-counter stool tests or certain medications (like NSAIDs) that may affect results.
What the Results Mean
A positive result means blood is likely present, prompting further testing (like a colonoscopy) to determine the cause. A negative result doesn’t rule out bleeding entirely but suggests no obvious signs of hidden blood in this sample.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
FIT-DNA Probe Test
Frequently asked questions
This test is commonly used as a screening tool for colorectal cancer, especially in individuals at higher risk or as part of routine health checks. Early detection can improve treatment outcomes, so results should always be discussed with your healthcare provider.
How often should I get this test? Your doctor will determine the best schedule based on your medical history and risk factors.
Will insurance cover this test? Coverage depends on your plan and whether your doctor orders it for screening or diagnostic purposes.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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