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Anemia and Iron deficiency even when related, they must be distinguished. Anemia is defined as hemoglobin concentration or hematocrit below 90% or 95% of range for healthy persons. Iron deficiency is the main cause of anemia in developed and developing countries, but other causes may be involved, especially in developing populations. Iron status can range from iron deficiency anemia to iron overload, as shown by Cook et al.. Different stages can be identified by the results of different laboratory tests.