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White Blood Cell Clumping (Qualitative) in Whole Blood

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

This test checks whether white blood cells in your blood appear clumped together, which can sometimes happen due to certain medical conditions or lab processing.

Quick summary

["Clumping of white blood cells may signal potential blood disorders or errors in sample handling."]

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

Key facts at a glance

LOINC
67848-2
Short code
WBC clumps UrnS Ql Micro
Synonyms
WBC clumps UrnS Ql Micro
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
4.5
Ref high
11
Critical range
2 N/A – 30 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
CPT
85004
SNOMED
900000000000003002
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is WBC Clumping?

WBC clumping refers to the visual observation of white blood cells sticking together in a sample of whole blood. Normally, white blood cells should be evenly dispersed. Clumping can occur naturally during blood collection or storage, but it may also indicate underlying conditions like certain infections, immune disorders, or laboratory artifacts.

Why Might This Test Be Done?

Your healthcare provider may order this test if you have symptoms like fatigue, frequent infections, or unexplained bruising. It can also be part of routine blood work to check for abnormalities in your immune system or blood composition.

What Does the Result Mean?

If clumping is detected, it does not always mean a serious condition exists. However, it may prompt further investigation, such as additional blood tests or a review of your medical history and symptoms.

How Is the Test Performed?

A small amount of blood is drawn from a vein, usually in your arm. The sample is then examined under a microscope to look for clumping among white blood cells. This is a qualitative test, meaning it only provides a yes/no result about clumping presence.

Reference range

Adult: 4.5-11.0 x 10^9/LN/A

Specimen: urine

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

WBC Clumping Test

Frequently asked questions

What Are Common Causes of WBC Clumping?
Clumping can result from normal blood processing, such as improper mixing of the sample after collection. However, it may also be associated with conditions like autoimmune diseases (e.g., lupus), certain infections, or medications that affect blood cells. If clumping is found, your doctor may recommend retesting or additional tests to determine the cause.
How Can I Prepare for This Test?
No special preparation is needed for this test. You may have some mild discomfort or bruising at the site where the blood was drawn, but this usually goes away quickly.
Can I Get the Results Over the Phone?
Results are typically reviewed by your healthcare provider and discussed during your next appointment. If clumping is detected, they may schedule a follow-up to clarify next steps.
  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