A red blood cell count (RBC count) is a blood test that measures the number of red blood cells in a blood sample. Red blood cells carry oxygen from the lungs to the rest of the body and return carbon dioxide to the lungs to be exhaled. This test helps evaluate overall health and diagnose conditions such as anemia, which is a lack of red blood cells, or other blood disorders. A low level can be a sign of anemia or blood loss, while a high level might suggest conditions such as polycythemia or dehydration.

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