單項(xiàng)選擇題患兒男,2歲,因“外傷后右肘關(guān)節(jié)腫脹3d”來(lái)診。既往偶有皮下淤斑史,無(wú)明確血友病家族史。查體:皮膚無(wú)出血點(diǎn);右肘關(guān)節(jié)明顯腫脹,局部皮膚無(wú)淤斑;肝、脾不大。實(shí)驗(yàn)室檢查:Hb105g/L,RBC3.4×10/L,WBC6.0×10/L,PLT130×10/L;APTT延長(zhǎng),PT正常。診斷首先應(yīng)考慮()

A.晚發(fā)性維生素K依賴因子缺乏癥
B.血友病A/B
C.血小板無(wú)力癥
D.維生素C缺乏癥
E.鼠藥中毒


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4.單項(xiàng)選擇題患兒男,10個(gè)月,單純母乳喂養(yǎng),1個(gè)月前反復(fù)腹瀉。查體:皮膚、黏膜輕度蒼白;肝肋下1cm,脾肋下1cm。血常規(guī):Hb80g/L,RBC3.2×10/L,WBC5.0×10/L,PLT121×10/L。患兒外周血形態(tài)學(xué)檢查結(jié)果應(yīng)該是()

A.MCV(fl)80~94,MCH(pg)28~32,MCHC(g/L)320~380
B.MCV(fl)80~98,MCH(pg)28~36,MCHC(g/L)320~400
C.MCV(fl)>94,MCH(pg)>32,MCHC(g/L)320~360
D.MCV(fl)<80,MCH(pg)<28,MCHC(g/L)320~360
E.MCV(fl)<80,MCH(pg)<28,MCHC(g/L)<320