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Serum or Plasma Basophil Count (Absolute)

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.

Quick summary

["Basophils help your body respond to allergens and infections by releasing chemicals like histamine."]

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

Key facts at a glance

LOINC
7698-4
Short code
Sheep Epith BasoBnd Ab Qn
Synonyms
Sheep Epith BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
lhr
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

What Are Basophils?

Basophils are a rare but important part of your immune system. They release substances that can trigger allergic responses, such as swelling or itching, and help fight certain infections. While they’re not as common as other white blood cells, they play a role in long-term immune reactions.

Why Might You Need This Test?

Your doctor may order a basophil count to investigate symptoms like persistent itching, skin rashes, or unexplained swelling. It can also help diagnose conditions like chronic urticaria (hives), allergic disorders, or certain blood disorders.

When Is This Test Performed?

Basophil counts are often checked alongside other blood tests when allergies, infections, or immune system issues are suspected. Blood is drawn from a vein, and the test measures the cell count in your serum or plasma.

What to Expect Before the Test

No special preparation is needed. You may have a small bandage on the site where the blood is drawn, and you’ll likely feel a brief pinch. If you’re on blood-thinning medication, let your doctor know before testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Basophil Count

Frequently asked questions

Why might elevated basophil levels be concerning?
Elevated basophil counts can signal chronic allergic conditions, certain infections, or rare blood disorders. However, they’re often normal and may rise slightly during stress or certain immune responses. Your doctor will consider your symptoms and other test results to interpret results.
How do low basophil levels affect health?
Low basophil counts are less common but may occur with certain immune deficiencies or medications. They’re rarely a standalone concern unless paired with other symptoms like fatigue or frequent infections.
What triggers changes in basophil levels?
Basophil counts can fluctuate due to allergies, infections, stress, or medications. Hormonal changes or certain medical conditions may also influence their numbers.
  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