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| | Blood Cell Counts |
 | | The mature red blood cell (also known as an erythrocyte) carries oxygen attached to the iron in hemoglobin. |
 | | The number of red blood cells is determined by age, sex, altitude, exercise, diet, pollution, drug use, tobacco/nicotine use, kidney function, etc. The clinical importance of the test is that it is a measure of the oxygen carrying capacity of the blood. |
 | | The hematocrit is one of the most precise methods of determining the degree of anemia or polycythemia (excessive amount of red blood cells). |
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