Myeloperoxidase Stain

**Semantic type:** Laboratory Procedure

**Definition:** Immunohistochemical or enzyme cytochemical staining method to detect myeloperoxidase, a lysosomal protein that has peroxidase enzyme activity and is present in granulocytic and monocytic cells, but absent in lymphocytes.

**Synonyms:** - MPO Stain - MYELOPEROXIDASE STAIN