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Basophil count (per microliter of whole blood)

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

This test measures the number of basophils, a type of white blood cell involved in allergic reactions and inflammation. Basophils help the body respond to infections and allergens by releasing chemicals.

Quick summary

["Basophils help protect your body against infections and allergies, but elevated levels may signal underlying conditions."]

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

Key facts at a glance

LOINC
75023-2
Short code
CD63 Basophils/Basophils NFr Bld FC
Synonyms
CD63 Basophils/Basophils NFr Bld FC
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why is this test done?

Your doctor may order a basophil count to investigate symptoms like persistent itching, skin rashes, or unexplained swelling. It can also help diagnose conditions such as allergic disorders, certain blood cancers, or chronic inflammatory diseases.

What to expect before the test

No special preparation is needed. The test involves a simple blood draw from a vein, usually in your arm. You may feel a slight pinch, but it’s quick and typically painless.

What the results mean

Basophil counts can vary. High levels may indicate allergies, infections, or conditions like chronic myeloid leukemia. Low levels might suggest immune system issues or certain autoimmune disorders. Always discuss results with your healthcare provider.

Common reasons for testing

Basophil counts are often checked when symptoms like persistent itching, unexplained swelling, or fatigue suggest an underlying immune or blood disorder. Doctors may also use it as part of a broader blood panel for suspected leukemia or other hematologic conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance

Short name

Basophil blood test

Frequently asked questions

What does an elevated basophil count mean?
Elevated basophils can signal chronic inflammation, allergic reactions, or certain blood cancers. For example, high basophil levels are sometimes seen in allergic disorders or conditions like mastocytosis. Your doctor will consider your symptoms and other test results to determine the cause.
What does a low basophil count mean?
Low basophil counts may indicate immune system dysfunction, certain infections, or conditions affecting white blood cell production. It’s less common but can occur in autoimmune diseases or after certain treatments. Your doctor will review your overall health and other test results to interpret this result.
How often should I get this test?
Basophil counts are usually checked as part of routine blood tests or when symptoms suggest an issue. If you have a known condition like allergies or blood cancer, your doctor may recommend regular monitoring. Follow their advice for test frequency.
  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