正确地预测胎龄在妊娠或并发症的治疗方面是非常重要的。临床常以不同的方法综合估计胎龄。超声测量已成为估计胎龄的标淮方法。妊娠早期可用顶臀长的测量正确估计胎龄,妊娠20周以后多应用双顶径测量。最近作者证实孕早期测量母血清hCG 浓度估计胎龄的正确性。本文前赡性地比较了以已知胎龄产母血清 hCG 浓度和超声测量顶臀长和双顶径估计胎龄的正确性。本文取 Kentucky 大学门诊部15名受检者从早孕起进行监护。其胎龄均有可靠根据即规律的月经周期4—7天/26～30天,可靠的末次月经、基础体温推测排卵日期、早孕时体检等。用三种方法估计这些病人的预产期和胎龄:在末次月经后60天取1～2次母血清作 hCGβ亚单位浓度测量;8～16周作胎儿顶臀长测定;18～32周超声测量双顶径二 Correctly predicting gestational age is very important in the treatment of pregnancy or complications. Clinical often different methods to estimate gestational age. Ultrasound measurements have become the standard method of estimating gestational age. Pregnancy can be used to measure the height of the top rump correctly estimated gestational age, more than 20 weeks after pregnancy double-apex measurement. The authors recently confirmed the correctness of gestational age in estimating gestational age for hCG concentrations measured in early pregnancy. In this paper, the accuracy of hCG concentrations in gestational age-proven maternal serum and gestational age at the top of the hip and biparietal diameter measured by ultrasound was compared beforehand. This article take Kentucky University clinics 15 subjects from early pregnancy monitoring. The gestational age are reliable based on the regular menstrual cycle 4-7 days / 26 to 30 days, reliable last menstruation, basal body temperature speculation ovulation date, physical examination during pregnancy. Three methods were used to estimate the expected date and gestational age of these patients: one or two maternal serum samples were taken for hCGβ subunit concentration measurement at 60 days after the last menstruation; the fetal top-hip length was measured at 8 to 16 weeks; Top two