Rarely, in some kidney cancers and sometimes after kidney transplants, the kidneys might produce too much erythropoietin. This enhances red blood cell production. Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis. There is a problem with information submitted for this request. Sign up for free, and stay up-to-date on research advancements, health tips and current health topics, like COVID, plus expert advice on managing your health.
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An RBC count that is higher or lower than normal is often the first sign of an illness. So the test may allow you to get treatment even before you have symptoms.
A red blood cell RBC count is almost always part of a complete blood count , a group of tests that measure many different parts and features of your blood. The RBC measurement is used to help diagnose red blood cell disorders, such as anemia , a condition in which your body does not make enough healthy red blood cells. You may get this test as part of a complete blood count, which is often included in a routine checkup. You may also need this test if you have symptoms of a low or high red blood cell count.
A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes. There is very little risk to having a blood test. Why do I need an RBC count? How is the RBC count performed? How should I prepare for the RBC count?
What are the risks of getting an RBC count? What is the normal range for an RBC count? What does a higher than normal count mean? What does a lower than normal count mean? Red blood cells and blood cancers. What if I have abnormal results?
Read this next. Medically reviewed by Shuvani Sanyal, MD. Medically reviewed by Debra Sullivan, Ph. RBC Indices. Ceruloplasmin Test. Medically reviewed by Kristen M. Moyer, MD. Medically reviewed by Emelia Arquilla, DO. Haptoglobin Test. Red blood cell count. Red blood cells contain a substance called haemoglobin, which transports oxygen around the body.
A normal RBC count would be: men — 4.
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