Hemoglobin (Hgb). Hemoglobin is the major substance in a red blood cells. It carries oxygen and gives the blood cell it’s red color. The hemoglobin test measures the amount of hemoglobin in blood and is a good indication of the blood’s ability to carry oxygen throughout the body.
This is part of the CBC – Complete Blood Count Test.
More definitions of Hemoglobin on the web found here.