Red Blood Cells

What is Red Blood Cells?

Red blood cells (erythrocytes) are the most numerous cells in blood, produced in the bone marrow at a rate of about 2 million per second. Their primary function is oxygen transport via hemoglobin. RBCs are unique — they lack a nucleus and mitochondria, allowing maximum space for hemoglobin. They live approximately 120 days.

What might a high or low Red Blood Cells mean?

Low RBC count (anemia) impairs oxygen delivery to tissues, causing fatigue and exercise intolerance. High RBC count (polycythemia) thickens blood, increasing clot and stroke risk. RBC count is interpreted alongside hemoglobin, hematocrit, and red cell indices (MCV, MCH, MCHC) for a complete picture.

What is the typical reference range for Red Blood Cells?

The general-population reference range shown here is 4.5 – 5.9 10x12/L. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.

What can affect Red Blood Cells?

It may be higher with: Dehydration, Smoking, Living at high altitude, Testosterone therapy, Polycythemia vera, Chronic lung disease, Sleep apnea, EPO (erythropoietin). It may be lower with: Iron deficiency, B12/folate deficiency, Blood loss (acute or chronic), Chronic kidney disease, Bone marrow suppression, Chronic inflammatory disease, Hemolytic disorders, Aplastic anemia.