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Colorectal Cancer Endoscopic Screening (Fecal DNA Test)

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

This test checks for genetic markers in your stool that may indicate an increased risk of colorectal cancer, even when no symptoms are present.

Quick summary

["Early detection through genetic screening can help identify potential cancer risks before symptoms appear."]

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

Key facts at a glance

LOINC
111954-4
Short code
Dx Colon Endscpy
Synonyms
Dx Colon 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 analyzes DNA fragments in your stool sample to detect mutations or abnormal DNA patterns linked to colorectal cancer. These markers can come from precancerous polyps or early cancer cells.

How the Test Works

A simple stool sample is collected, and specialized lab techniques identify specific DNA sequences that may signal cancer risk. This is often part of a broader screening program.

Why It Matters

Colorectal cancer often develops silently, so detecting genetic markers early can allow for preventive measures like closer monitoring or early treatment options.

Who Might Need This Test

This test may be recommended for individuals with a family history of colorectal cancer, those at higher genetic risk, or as part of routine screening in certain populations.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps identify genetic markers that may indicate an increased risk of colorectal cancer, prompting further evaluation or preventive actions. While not a definitive cancer test, it can guide next steps in monitoring or treatment planning.

Short name

Fecal DNA Screening

Frequently asked questions

What does a positive result mean?
A positive result suggests the presence of genetic markers that may warrant additional testing, such as a colonoscopy, to further investigate potential risks.
Will I need to prepare for this test?
Preparation typically involves collecting a stool sample at home or during a clinic visit. Follow your healthcare provider’s instructions for best results.
Is this test painful or invasive?
No, this test involves a simple stool sample, so there is no pain or invasive procedure required.
  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