White Blood Cell Clumping (Leukocyte Aggregation) Screening Test
This test checks for abnormal clumping of white blood cells, which may indicate certain immune system conditions or infections.
["Clumping of white blood cells can signal underlying health concerns that may need further evaluation."]
Key facts at a glance
- LOINC
- 105102-8
- Short code
- WBC clumps # Ur
- Synonyms
- WBC clumps # Ur
- 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
- 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?
White blood cells normally move freely through your bloodstream. In some cases, they may clump together, forming larger aggregates. This can happen due to infections, immune disorders, or certain medications. The test helps identify if this clumping is present.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms like fever, fatigue, or unexplained infections. It can also be part of routine blood work to monitor immune function or check for conditions like leukemia or autoimmune diseases.
What Does the Result Mean?
If clumping is detected, it doesn’t always mean a specific diagnosis. The result may prompt further testing, such as a complete blood count (CBC) or additional immune system evaluations. Your doctor will interpret the findings in the context of your symptoms and medical history.
How Is the Test Performed?
A small blood sample is drawn from a vein, usually in your arm. The sample is then examined under a microscope to look for abnormal clumping patterns. This is typically done as part of a routine blood test.
Reference range
Adult: 4.5-11.0 x 10^9/LN/A
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 Screening
Frequently asked questions
WBC clumping can be associated with conditions like chronic infections, certain cancers, or immune system disorders. While it doesn’t always indicate a specific illness, it may signal the need for further investigation to understand your health better.
How often should I get this test?
Can lifestyle changes affect WBC clumping?
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