🩸 Hematology

Basophil: What It Means for Your Health

Basophils are the least common type of white blood cell, typically making up less than 1% of the total WBC count. They contain histamine and heparin granules and play a role in allergic reactions, inflammation, and immune responses to parasites. Despite being rare, significant changes in basophil count can indicate important conditions.

Full Name
Basophil Percentage
Normal Range
0–1 %
Also Known As
Basophil %, BAS, Baso

Reference Range

LowNormal: 0–1 %High

Reference ranges may vary between laboratories, age groups, and sexes. The values shown are general adult reference ranges. Always compare your results to the specific range provided by your testing laboratory.

What Is Basophil?

Basophils are the least common type of white blood cell, typically making up less than 1% of the total WBC count. They contain histamine and heparin granules and play a role in allergic reactions, inflammation, and immune responses to parasites. Despite being rare, significant changes in basophil count can indicate important conditions.

Commonly included in:

Complete Blood Count (CBC)WBC Differential

What Does High Basophil Mean?

Above 1 %

Elevated basophils (basophilia) may indicate allergic reactions, chronic myelogenous leukemia (CML), myeloproliferative disorders, hypothyroidism, ulcerative colitis, or chronic inflammation. Persistent basophilia should be evaluated for blood cancers.

What Does Low Basophil Mean?

Below 0 %

Low basophil count (basopenia) is difficult to detect because basophils are already so rare. It can occur with acute allergic reactions (when basophils degranulate), hyperthyroidism, or corticosteroid therapy.

Related Biomarkers in Hematology

Hemoglobin
Oxygen-carrying protein found inside red blood cells.
Range: 12–17.5 g/dL
Hematocrit
Percentage of blood volume occupied by red blood cells.
Range: 36–50 %
WBC
Total white blood cell count measuring immune system activity.
Range: 4.5–11 10^3/uL
RBC
Total number of red blood cells in your blood.
Range: 4–5.5 10^6/uL
Platelet
Blood cells responsible for clotting and wound healing.
Range: 150–400 10^3/uL
MCV
Average size of your red blood cells.
Range: 80–100 fL

Track Your Basophil Over Time

Upload your blood test results to Hemoly and see how your Basophil levels change over time. Get trend analysis, educational insights, and a personal health timeline.

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Medical Disclaimer

This information is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Reference ranges may vary between laboratories. Always consult a qualified healthcare professional for interpretation of your blood test results and before making any health decisions.