Anaemia is defined as a reduction in one or more of the red blood cell indices of Hemoglobin (Hb) concentration, Hematocrit, and Red blood cell (RBC) count. However, Hemoglobin concentration is the most widely used parameter.

• Normal lower limits of "Hb" varies with age, sex and race.
• As a Clinician, one is often familiar with the Kinetic Approach to a patient with Anemia.
• This approach classifies Anemia by the mechanisms causing the Anemia. These mechanisms are decreased red blood cell production, increased red blood cell destruction and blood loss.

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