Which FAB classification demonstrates at least 3% positivity with peroxidase or SBB,

Question

Which FAB classification demonstrates at least 3% positivity with peroxidase or SBB, <20% positivity with nonspecific esterase, and contains primarily myeloblasts with distinct nucleoli?

Quizplus · Accepted Answer

The FAB (French-American-British) classification M1 is characterized by a predominance of myeloblasts with distinct nucleoli, at least 3% positivity with peroxidase or Sudan Black B (SBB), and less than 20% positivity with nonspecific esterase, which aligns with the description provided.

Which FAB Classification Demonstrates at Least 3% Positivity with Peroxidase