What is hematocrit?

Dr. Michael Roizen, MD
Internal Medicine
This is the percentage of whole blood comprising red blood cells. It's a measure of both the number and the size of these cells and is expressed as a percentage by volume. A low hematocrit may indicate anemia, blood loss, bone marrow failure, destruction of red blood cells, or malnutrition or specific nutritional deficiency. A high hematocrit may indicate dehydration and a few other conditions.
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