Myths vs facts: Transferrin and Müdigkeit

Transferrin is an iron transport protein often used as a marker of iron status. A common myth is that low transferrin directly causes fatigue, or that high transferrin always indicates iron deficiency. In reality, transferrin increases in iron deficiency (compensatory), while it can decrease in inflammation, liver disease, or protein deficiency. Fatigue can result from iron deficiency anemia, but also from many other factors like poor sleep, stress, or thyroid issues. An isolated transferrin value without ferritin, hemoglobin, and transferrin saturation is of limited use. DNA tests claiming to predict iron metabolism are generally not clinically validated. The evidence linking transferrin to fatigue is strong, but only in the context of a complete iron panel. Caution: do not self-diagnose; consult a physician for proper interpretation.