Iron blood levels and iron storage increase when more iron is absorbed than the body needs. Absorbing too much iron can lead to ... Iron deficiency. The early stage of iron deficiency is the slow depletion of iron stores. This means there is still enough iron ... The serum iron test is used to measure the amount of iron that is in transit in the body - the iron that is bound to ... Iron poisoning occurs when a large dose of iron is taken all at once or over a short period of time. Iron poisoning in children ...