患者张某,42岁,发热两周,伴进行性贫血,全身乏力,急诊入院,体温39.2℃,脉搏98/分,B超检查提示脾肿大,初诊为亚急性细菌性心内膜炎,需做血培养进一步明确诊断,应取血
A.2~3ml
B.4~5ml
C. 6~8ml
D.10~15ml
答案：D【解析】一般血培养取血5ml,对亚急性细菌性心内膜炎病人,为提高培养阳性率,采血10~15ml