What is a hemoglobin test?

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.

What is it used for?

A hemoglobin test is often used to check for anemia, a condition in which your body has fewer red blood cells than normal. If you have anemia, your cells don't get all the oxygen they need. Hemoglobin tests are also frequently performed with other tests, such as:

• Hematocrit, which measures the percentage of red blood cells in your blood
• Complete blood count, which measures the number and type of cells in your blood

Why do I need a hemoglobin test?

You can do the test as part of a routine exam, or if you have:

• Symptoms of anemia, which include weakness, dizziness, pale skin, and cold hands and feet
• A family history of thalassemia, sickle cell anemia, or other inherited blood disorder
• A diet low in iron and minerals
• A long-term infection
• Excessive blood loss from an injury or surgical procedure