胆道恶性梗阻行PTCD术前，下列哪项生化检查是必须的：

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24724' and id < 2117754 and id<>'2117754' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24724' and id > 2117754 and id<>'2117754' order by id asc limit 5