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为探讨血清人绒毛膜促性腺激素 (HCG)水平作为估计孕龄 (GA)界值的准确性 ,作者进行了此研究。基础数据来自以前进行的妊娠小于和大于 49天行医学流产妇女的研究资料 ,事前整个的研究都作了β- HCG的测定和阴道超声检查。阴道超声检查对 GA的评估采用下列标准 :GA(天数 ) =平均
To investigate the accuracy of serum human chorionic gonadotropin (HCG) levels as an estimate of gestational age (GA) cutoff, the authors conducted this study. The underlying data come from previous studies of women who had undergone medical abortion with less than 49 days of gestation and all had prior studies of β-HCG and vaginal ultrasound. Vaginal ultrasound examination of GA using the following criteria: GA (days) = average