Red Blood Cell (RBC) is a blood test which conducts by doctors to check how many red blood cells you have in the body. In fact, this is known as an erythrocyte count and it is important because it contains hemoglobin and carries oxygen to your body. The number of oxygen you have is to receive oxygen to function accordingly. You will not get a lower count of the RBC count because it gives illness. If your RBC is too high or too low, you could experience symptoms and complications. In men and women, the RBC rate must be different as per the generic reasons.