A hemoglobin test measures the levels of hemoglobin in your blood. Hemoglobin is a protein

in your red blood cells that carries oxygen from your lungs to the rest of your body. If your

hemoglobin levels are abnormal, it may be a sign that you have a blood disorder.A

hemoglobin test is often used to check for anemia, a condition in which your body has fewer

red blood cells than normal.