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Enterocolitis Antigen (Bacterial or Parasitic) in Stool

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

This test helps identify bacteria or parasites that may be causing an infection in your digestive tract.

Quick summary

["A stool test to check for harmful microbes that could be causing symptoms like diarrhea, stomach pain, or blood in stool."]

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

Key facts at a glance

LOINC
109115-6
Short code
Y enterocol IgA Msmt Ser
Synonyms
Y enterocol IgA Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 specific antigens from common bacteria (like *E. coli*, *Salmonella*, or *Shigella*) and parasites (like *Giardia*, *Cryptosporidium*, or *Entamoeba*) that can cause gastrointestinal illness. It does not measure viruses or specific bacterial cultures.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms such as persistent diarrhea, abdominal pain, blood in stool, or unexplained weight loss, especially after traveling to areas with different hygiene standards.

What to Expect Before the Test

No special preparation is needed. Collect a fresh stool sample in the provided container, following the instructions provided by your lab or healthcare provider. Avoid using toilet paper or feminine hygiene products in the sample.

What to Expect During the Test

The test involves analyzing a small portion of your stool sample using immunoassay methods (like enzyme-linked immunosorbent assay, or ELISA) to detect the presence of specific antigens. Results are typically available within 24 to 48 hours.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Stool Pathogen Screen

Frequently asked questions

How long does it take to get the results?
Results are usually available within 24 to 48 hours, depending on the lab’s processing schedule.
What does a positive result mean?
A positive result suggests the presence of a bacterial or parasitic infection that may require treatment with antibiotics or antiparasitic medication. Your healthcare provider will discuss the next steps based on the specific pathogen detected.
Can I take antibiotics before the test?
Yes, you may take antibiotics, but inform your healthcare provider before the test. Antibiotics can affect the test results, so they may need to be adjusted or retested later.
  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