Hemoglobin is an existing protein in red blood cells (red blood cells), which is responsible for carrying oxygen from the lungs to different body tissues and carbon dioxide from tissues to the lungs. This analysis measures the concentration of hemoglobin in the blood in the gram of each desiliter (g / del) or for per liter (g / l). It is the basic component in diagnosis of anemia (when low) and the frequent real red or dehydration (when it is high).