It can be hard to know whether you have anemia, because it can happen with or without symptoms. Also, many of the symptoms of anemia are not obvious, because they can be caused by other health problems. If you are having symptoms, you should talk to your doctor right away.
Even if you are not having symptoms, you should talk to your doctor about anemia if you have kidney failure. Anemia is very common in patients on dialysis, and also happens in patients with a kidney transplant.
The only way to know if you have anemia is to have a blood test, which checks for the amount of hemoglobin in your blood. Hemoglobin is a part of your red blood cells. Figuring out the amount of hemoglobin in your blood can tell your doctor how many red blood cells you have, and whether you have anemia.