Chemicals and Drugs

Hemoglobin A2

An adult hemoglobin component normally present in hemolysates from human erythrocytes in concentrations of about 3%. The hemoglobin is composed of two alpha chains and two delta chains. The percentage of HbA2 varies in some hematologic disorders, but is about double in beta-thalassemia.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An adult hemoglobin component normally present in hemolysates from human erythrocytes in concentrations of about 3%. The hemoglobin is composed of two alpha chains and two delta chains. The percentage of HbA2 varies in some hematologic disorders, but is about double in beta-thalassemia.

MeSH Record

Classification

Broader headings

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MeSH Record

Synonyms

1 entry terms
  • A2, Hemoglobin

MeSH Record

Aspects Covered

30 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, agonists, analogs & derivatives, analysis, antagonists & inhibitors, biosynthesis, cerebrospinal fluid, chemical synthesis, chemistry, classification, deficiency, drug effects, economics, genetics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, ultrastructure, urine.

MeSH Record

Indexing Annotation

/urine: coordinate with HEMOGLOBINURIA

MeSH Record

History Note

91(79); was see under HEMOGLOBIN A 1979-90

MeSH Record

Previous Indexing

  • Hemoglobin A (1977-1978)
  • Hemoglobins (1966-1976)

MeSH Hierarchy

Tree Numbers

AMA Style

References

  1. National Library of Medicine. Hemoglobin A2. Medical Subject Headings (MeSH). 2026. Unique ID D006443. http://id.nlm.nih.gov/mesh/2026/D006443
  2. Hemoglobin A2. In: Wikipedia. https://en.wikipedia.org/wiki/Hemoglobin_A2
  3. Hemoglobin A2. In: Wikidata. https://www.wikidata.org/wiki/Q426738