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Lymphocyte Count in Stool (for Inflammatory Bowel Disease or Infectious Diarrhea Evaluation)

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

This test measures the number of lymphocytes (a type of white blood cell) found in your stool. It may help diagnose or monitor conditions like inflammatory bowel disease (e.g., Crohn’s disease) or infections causing diarrhea.

Quick summary

["Lymphocytes in stool can signal inflammation or infection in your digestive system."]

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

Key facts at a glance

LOINC
20615-1
Short code
Lymphs IgD/lymph NFr Spec
Synonyms
Lymphs IgD/lymph NFr Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, abdominal pain, or unexplained weight loss. It’s also used to check for conditions like inflammatory bowel disease or infections that affect the gut’s immune response.

How the Test Works

A small sample of your stool is examined under a microscope to count lymphocytes. This process helps identify if there’s an abnormal presence of these cells, which could indicate inflammation or infection.

Sample Collection and Preparation

Collect a fresh stool sample in a clean container, following your provider’s instructions. Bring it to the lab within 24 hours for best accuracy. Avoid using toilet paper or cleaning agents that might alter results.

What to Expect Before the Test

No special preparation is usually needed, but inform your provider if you’re taking medications that could affect gut health or if you have recent antibiotic use.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Stool Count

Frequently asked questions

What does a high lymphocyte count in stool mean?
A high count may signal ongoing inflammation or immune activity in your digestive tract, potentially linked to conditions like inflammatory bowel disease or certain infections.
How soon will I get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your provider will discuss them with you.
Can I eat or drink before this test?
No special diet is required, but avoid excessive fiber or dairy if instructed by your provider, as they might affect stool consistency or analysis.
  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