As a hematologist, I specialize in the study and treatment of blood disorders, including anemia. Anemia is a condition characterized by a decrease in the number of red blood cells or less than the normal quantity of hemoglobin in the blood, which can impair the ability of the blood to carry oxygen to the body's tissues.

Severe anemia is generally considered to be a hemoglobin level that is significantly below the normal range. The normal hemoglobin range is typically between 13.5 to 17.5 grams per deciliter (g/dL) for men and 12.0 to 15.5 g/dL for women. Severe anemia can be defined as a hemoglobin level of:

- Less than 8 g/dL in adults
- Less than 7 g/dL in children

These levels can vary slightly depending on the source and the specific criteria used by different medical organizations. It's important to note that the symptoms and risks associated with severe anemia can be quite serious, including fatigue, shortness of breath, chest pain, dizziness, and even heart failure or other life-threatening complications if not treated promptly.

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The severity of anemia is categorized by the following hemoglobin concentration ranges: Mild anemia is considered when hemoglobin is between 9.5 - 13.0 g/dL. Moderate anemia is considered when hemoglobin is between 8.0 - 9.5 g/dL. Severe anemia is considered for hemoglobin concentrations below 8.0 g/dL.read more >>