According to WebMD, phlebotomy is a procedure that takes blood from the body. Routine phlebotomy may be used to treat people who have too much iron in their blood or those who produce too many red blood cells. Approximately 500 milliliters of blood are removed during a phlebotomy.
As WebMD explains, a phlebotomy procedure typically takes about 30 minutes. Fasting or any other kind of special preparation is not required prior to phlebotomy. Some people experience fatigue or dizziness after the procedure. Eating a nutritious meal and drinking plenty of fluids before phlebotomy help prevent people from feeling tired or dizzy afterward. Phlebotomy is considered to be safe when performed by a health professional.