Blood/Blood Cells and Cellular Components ›› Red Blood Cells ›› Abnormal

Hemoglobin H Inclusion*

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Microscopic Features:
  • Multiple small blue-purple granules distributed within an RBC and visualized with special stain
  • Composed of precipitated chains of beta-hemoglobin (tetramer of beta chain) seen in some alpha thalassemia
Normal % blood-PB, marrow-BM, lymphoid tissue-LN:
  • PB: None
  • BM: None
  • LN: None
May Resemble: Differential Diagnoses:

Alpha Thalassemia
Myeloproliferative syndromes (sometimes)
Erythroleukemia (AML-M6): sometimes

Classic Immunophenotype:
  • N/A
Cartoon Image:

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  • Seen with special supravital stain. In some alpha thalassemias, the decreased production of alpha chains leads to an excess of beta chains which can form beta-tetramers and precipitate

Content Editors/Website Administrators:
Hooman H. Rashidi, MD; John C. Nguyen, MD