what is RBC in blood test
A red blood cell count is a blood test that your doctor uses to find out how many red blood cells (RBCs) you have in your blood. It is also called an erythrocyte count.The test is important because RBCs contain hemoglobin, which carries oxygen to your bodyâs tissues.The number of RBCs you have can affect how much oxygen your tissues are receiving.he test is important because RBCs contain hemoglobin, which carries oxygen to your bodyâs tissues. The number of RBCs you have can affect how much oxygen your tissues are receiving.