What is a band neutrophil?

By William Aird

A band neutrophil is a young neutrophil with deeply indented nucleus. The nucleus is indented to more that half the distance to the farthest nuclear margin. Chromatin is consistently present between edges of nuclear membrane, but in no area is it condensed to a single filament. Normally comprise < 10% of circulating white cells. Increased numbers in left shift (as occurs with inflammation and infection) and myeloproliferative neoplasms.

From Shutterstock, with permission.
Peripheral smear showing band neutrophil in center. From Shutterstock, with permission.