Merck Manual

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Basophilic Disorders

By

Mary Territo

, MD, David Geffen School of Medicine at UCLA

Last full review/revision Aug 2021| Content last modified Sep 2022
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Basophils account for less than 3% of the circulating white blood cells (0 to 300 basophils per microliter of blood [0 to 0.3 × 109 per liter]).

The symptoms usually depend on the disorder that is causing the change in the number of basophils, but increased numbers of basophils can cause itching and other allergic reactions.

The change in the number of basophils is usually detected by chance when a complete blood count is done for other reasons.

Treatment is directed at the disorder that is causing the change in the number of basophils.

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