Hemoglobin is a protein in red blood cells that carries oxygen. A blood test can tell how much hemoglobin you have in your blood.
See also: Hemoglobin electrophoresis
A blood sample is needed. For information on how this is done, see: Venipuncture
No special preparation is necessary.
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Normal results vary, but in general are:
Note: gm/dL = grams per deciliter
Lower-than-normal hemoglobin may be due to:
Higher-than-normal hemoglobin may be due to:
Additional conditions under which the test may be performed:
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include: