Basophils (Absolute Basophil Count): What Your Result Means
Result guide · Complete Blood Count
Content last reviewed 2026-09-12 · Educational information — not medical advice
Quick answer
Basophils are the rarest white blood cells, involved in allergic reactions and inflammation. A high basophil count is uncommon and usually points to allergy, a chronic inflammatory state, or occasionally a bone-marrow disorder; low counts are normal.
What is Basophils (Absolute Basophil Count)?
Basophils make up well under 1% of circulating white cells and release histamine and other mediators during allergic and inflammatory responses. Because they are so few, small absolute changes can look dramatic as percentages — the absolute count matters more than the percentage.
Typical reference interval: Commonly about 0–200 cells/µL (0–1% of a normal white count).. Laboratories differ — the interval printed on YOUR report always governs.
If your Basophils (Absolute Basophil Count) is high
Common reasons Basophils (Absolute Basophil Count) runs above the reference interval:
- Allergic conditions — hay fever, asthma, and other atopic disorders can raise basophils
- Chronic inflammation — ulcerative colitis and other inflammatory states
- Hypothyroidism — an underactive thyroid can modestly elevate basophils
- Myeloproliferative disorders — persistent marked elevation with other abnormal counts needs hematology review
If your Basophils (Absolute Basophil Count) is low
Common reasons Basophils (Absolute Basophil Count) runs below the reference interval:
- Normal — basophils are often reported as zero, and that is normal
- Acute infection or stress — can transiently suppress counts
- Corticosteroids — steroid treatment lowers basophil counts
Symptoms worth knowing
No symptoms come from the basophil number itself; allergic or inflammatory symptoms come from the underlying condition.
What usually happens next
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Frequently asked questions about Basophils (Absolute Basophil Count) results
Is a basophil count of zero normal?
Yes. Basophils are the least common white cell, and zero is a routine finding that needs no follow-up.
What does high basophils mean?
Most often allergy or chronic inflammation; persistent marked elevation with other abnormal counts warrants hematology evaluation.
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