總鐵結合力[1]total iron-binding capacity,TIBC)又稱總鐵結合能力[2]總鐵結合容量運鐵蛋白結合力(transferrin iron-binding capacity),為醫學上用於表示轉鐵蛋白攜帶血中游離的能力[3]。TIBC的數值由抽血檢測獲得,評估血液中有能力和鐵結合的蛋白質有多少,並以此間接反映轉鐵蛋白的含量[4]。過去由於直接測量轉鐵蛋白相當昂貴,因此藉由量測TIBC來較為簡單便宜[5][6]。即使今日直接測定轉鐵蛋白已非難事,但TIBC依然廣被使用[7]

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