男，4岁。进食蚕豆后次日突然面色苍白，尿液呈红茶样来院急诊。査体：370C,神志清，贫血貌，巩膜轻度黄染，HR100次/分，心尖区可及2/6级收缩期杂音，肺、腹部无特殊。以往有食用蚕豆史。血常规：Hb68g/L，RBC2.8x1012/L,Ret6.0%，WBC15x109/L,PLT203x109/L。下列何种检査最有助于诊断

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