RBC measures the number of red blood cells in the blood. Red blood cells transport oxygen from the lungs to the rest of the body, and transport carbon dioxide back to the lungs. If the EPK is low (anaemia), the body is unable to get the oxygen it needs. If the level is too high (a condition known as polycythaemia), there is a risk of the red blood cells clumping together and blocking the tiny blood vessels (capillaries). This also makes it difficult for the red blood cells to transport oxygen.
RBC is an important part of any health check. Deviations from normal levels may indicate anaemia.
High levels are seen in cases of polycythaemia (polycythaemia vera, oxygen starvation, dehydration).
Low levels are seen in cases of anaemia.