Evidence check: Transferrin in the context of Fruchtbarkeit

Transferrin is an iron-transport protein commonly measured to assess iron status. Direct evidence linking transferrin levels to fertility is limited. While iron deficiency or overload can affect reproductive function, transferrin alone is not a validated fertility biomarker. Some consumer tests market transferrin as part of a 'fertility panel', but the evidence is weak and mostly mechanistic (iron metabolism → ovulation). Clinically, transferrin is used to diagnose iron deficiency anemia or hemochromatosis. Elevated transferrin may indicate iron deficiency; low transferrin may suggest iron overload – both can indirectly impact fertility. Caveat: Without complete blood count, ferritin, and medical evaluation, a single transferrin value is not diagnostic. Evidence: mechanistic/unclear. Sources: none from the provided context.