Iron: its role
Iron is essential for the synthesis of hemoglobin and other organic molecules such as myoglobin (muscle). Contributions by food should be 2 to 4 milligrams per day to compensate for losses (sweat, urine, feces, menstruation).

Iron deficiency is responsible for anemia, called anemia. The normal level of iron in the blood is 0.6 to 1.9 mg / l, e 1.1 and 2 mg / l in infants.
Iron blood increases when hemochromatosis, hepatitis, cirrhosis, and decreases in anemia, malabsorption, hemorrhage, vegetarian diet.
Ferritin
Ferritin is a protein circulating in blood, associated with iron molecules. The ferritin is significant reserves of iron in the body, and its determination allows early detection of deficiency or iron overload.
The normal level of ferritin is 30 to 60 mg / l in men and from 20 to 150 mg / l in women.
The ferritin decreased during pregnancy.