What is a blood transfusion for children? A blood transfusion is when blood is put into the body. During a blood transfusion, your child receives donated blood through one of his or her blood vessels.

A red blood cell count is a blood test that your doctor uses to find out how many red blood cells (RBCs) you have. It’s also known as an erythrocyte count. Your hematocrit is the volume of red ...

Seeing blood in semen (hematospermia or hemospermia) can cause worry. But for most men under 40 who have no underlying risk factors or associated symptoms, it tends to resolve on its own. While ...

Having blood in your urine (hematuria) does not always mean you have an underlying abnormality. It may simply be the result of heavy exercise or a side effect of a drug that needs to be changed.