Laboratory methods

Alpha-Naphthyl Acetate Esterase Activity in Monoblasts

Evaluating alpha-naphthyl acetate esterase activity in bone marrow smears to identify monocytic lineage cells: monoblast and promonocyte morphology.

Bone marrow smear, alpha-naphthyl acetate esterase reaction in a monoblast
Bone marrow smear, alpha-naphthyl acetate esterase reaction in a monoblast

CYTOCHEMISTRY IN HEMATOLOGY. 🔬A cell with strong α-naphthyl acetate esterase activity from a normal bone marrow smear. 👉This cell has a slightly convoluted nucleus and a relatively small amount of cytoplasm and is most likely a monoblast or an early promonocyte.