患者，女，60岁。身高163cm,体重75kg，体检发现空腹血糖6.7mmol/L,做口服葡萄糖耐量试验，OGTT2小时血糖为7.4mmol/L。治疗2个月后复査，为明确血糖控制情况，首选的检査是

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