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Classification of Anemia According to Underlying Mechanism.

Blood Loss

Acute: trauma
Chronic: lesions of gastrointestinal tract, gynecologic disturbances

Hemolytic anemia

Intrinsic abnormality
Extrinsic abnormality
Antibody mediated
Traumatic
Infection
Sequestration in spleen

Defective RBC production

Aplastic anemia
Defective DNA synthesis
Defective hemoglobin synthesis