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Multiple Choice

Normal Total Iron Binding Capacity (TIBC) range?

Total iron-binding capacity reflects how much iron transferrin can carry in the blood; it’s a measure of transferrin’s binding capacity, not the amount of iron itself. In adults, the normal range is about 250 to 450 micrograms per deciliter. This interval is wide because transferrin production varies with iron status and nutritional factors. When iron stores are low, the liver makes more transferrin, increasing TIBC. In contrast, inflammation, liver disease, or malnutrition can lower TIBC. Because the tested range falls within this commonly accepted normal window, it is the best choice. Other ranges lie outside the typical normal interval and would be considered abnormal in most adults.

Total iron-binding capacity reflects how much iron transferrin can carry in the blood; it’s a measure of transferrin’s binding capacity, not the amount of iron itself. In adults, the normal range is about 250 to 450 micrograms per deciliter. This interval is wide because transferrin production varies with iron status and nutritional factors. When iron stores are low, the liver makes more transferrin, increasing TIBC. In contrast, inflammation, liver disease, or malnutrition can lower TIBC. Because the tested range falls within this commonly accepted normal window, it is the best choice. Other ranges lie outside the typical normal interval and would be considered abnormal in most adults.