What is the immunochemistry hallmark finding of acute lymphoblastic leukemia (ALL)?

Updated: Oct 26, 2020
  • Author: Karen Seiter, MD; Chief Editor: Emmanuel C Besa, MD  more...
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A negative myeloperoxidase (MPO) stain and a positive and terminal deoxynucleotidyl transferase (TdT) is the hallmark of the diagnosis of most cases of acute lymphoblastic leukemia (ALL). However, positive confirmation of lymphoid (and not myeloid) lineage should be performed by flow cytometric demonstration of lymphoid antigens, such as CD3 (T-lineage ALL) or CD19 (B-lineage ALL).

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