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Definitions of anemia from the World Health Organization

Definitions of anemia from the World Health Organization
Population Hemoglobin
Non-anemic Mild anemia* Moderate anemia Severe anemia
Children 6 to 23 months ≥10.5 g/dL 9.5 to 10.4 g/dL 7.0 to 9.4 g/dL <7.0 g/dL
Children 24 to 59 months ≥11.0 g/dL 10.0 to 10.9 g/dL 7.0 to 9.9 g/dL <7.0 g/dL
Children 5 to 11 years ≥11.5 g/dL 11.0 to 11.4 g/dL 8.0 to 10.9 g/dL <8.0 g/dL
Children 12 to 14 years ≥12.0 g/dL 11.0 to 11.9 g/dL 8.0 to 10.9 g/dL <8.0 g/dL
Females ≥15 years
(non-pregnant)		 ≥12.0 g/dL 11.0 to 11.9 g/dL 8.0 to 10.9 g/dL <8.0 g/dL
Females, pregnant
  • First trimester
 ≥11.0 g/dL 10.0 to 10.9 g/dL 7.0 to 9.9 g/dL <7.0 g/dL
  • Second trimester
 ≥10.5 g/dL 9.5 to 10.4 g/dL 7.0 to 9.4 g/dL <7.0 g/dL
  • Third trimester
 ≥11.0 g/dL 10.0 to 10.9 g/dL 7.0 to 9.9 g/dL <7.0 g/dL
Males ≥15 years ≥13.0 g/dL 11.0 to 12.9 g/dL 8.0 to 10.9 g/dL <8.0 g/dL
Refer to UpToDate for additional caveats and definitions. To convert g/dL to g/L, multiply by 10 (eg, 7.0 g/dL = 70 g/L). Iron deficiency without anemia has consequences and can cause significant symptoms and disability before anemia develops.
* "Mild" is a misnomer: iron deficiency is already advanced by the time anemia is identified.
Adapted from: Guideline on haemoglobin cutoffs to define anaemia in individuals and populations, World Health Organization (Ed), Page xii, Copyright © 2024 World Health Organization. WHO is not responsible for the content or accuracy of this adaptation. https://www.who.int/publications/i/item/9789240088542 (Accessed on September 23, 2024).
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