Hemoglobin levels are dependent on a person's age and gender, states MedicineNet. The normal hemoglobin levels for an adult male are between 14 and 18 grams per deciliter of blood. The normal hemoglobin levels for an adult female are between 12 and 16 grams per deciliter of blood.
Hemoglobin is an essential part of the blood, states MedicineNet. The small protein molecule is found on red blood cells and helps transport oxygen molecules to all of the cells and tissues of the human body. It also carries carbon dioxide from the body's tissues to the lungs so that it can be expelled from the body.