A normal iron content in human blood is between 60 and 170 micrograms per deciliter, according to MedlinePlus. The total iron binding capacity (TIBC) normally ranges from 240 to 450 micrograms per deciliter.
A serum iron test is a blood test that measures the iron content in blood, states MedlinePlus. The test is often performed in the morning when blood iron levels are at their peak. The ranges for normal values can differ slightly between laboratories. High iron levels may indicate iron poisoning, a vitamin deficiency, liver problems or the breakdown of red blood cells. Low levels may indicate bleeding, pregnancy, or poor iron intake or absorption.