题目内容

女，56岁，有糖尿病史。发热、胸痛2天，咳少量脓痰偶带血丝。体检：体温39.5℃，呼吸24次/分，肺部无啰音。胸片示右下叶背段有淡薄浸润阴影，有透光区，血白细胞18×109/L，中性90%。应立即作哪项检查以指导用药( )

A. 血沉
B. 血电解质
C. 血培养
D. 痰细菌学检查
E. PPD试验

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