这通常由肝外胆道阻塞所引起。
Most often this is due to extrahepatic biliary tract obstruction.
但任何水平的胆道阻塞时，血清碱性磷酸酶都升高。
However, the serum alkaline phosphatase is increased with biliary tract obstruction at any level.
目的探讨胆汁型碱性磷酸酶同工酶在恶性肝外胆道阻塞诊断中的价值。
Aim To investigate the value of bile alkaline phosphatase isoenzyme in diagnosis of malignant extrahepatic biliary obstruction.
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