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目的:探讨B超估算孕周与月经周期的关系。方法:对1800例<50d早孕者,应用深圳EMP-1000型凸阵探头,探头频率3.5MHz～5.0MHz,膀胱适度充盈,仰卧位,经腹超声检查并与月经周期比较进行统计学分析。结果:月经周期<28d,B超估算孕周比胎龄大3d以上者86.0%;月经周期28d～32d,B超估算孕周与胎龄相符者89.6%;月经周期>32d,B超估算孕周比胎龄小3d以上者91.6%。不同月经周期B超估算孕周与胎龄差异有显著性(P<0.01)。结论:月经周期28d～32d,B超估算孕周直接查表,月经周期<28d或>32d,B超估算孕周应减去或加上月经提前或推后的天数。
Objective: To investigate the relationship between gestational age and menstrual cycle by B-ultrasound. Methods: 1800 cases of <50d pre-pregnancy, the application of Shenzhen EMP-1000 convex probe, probe frequency 3.5MHz ~ 5.0MHz, moderate bladder filling, supine position, abdominal ultrasound and compared with the menstrual cycle for statistical analysis. Results: The menstrual cycle was less than 28 days, the gestational age was 28.0% more than the gestational age, and the menstrual cycle was 28 days to 32 days. The B-ultrasound estimated 89.6% gestational age and gestational age. The menstrual cycle was> 32 days. Week than gestational age 3d small 91.6%. Different menstrual cycle B-estimated gestational age gestational age and gestational age were significantly different (P <0.01). Conclusion: The menstrual cycle 28d ~ 32d, B-ultrasound direct survey of gestational age checklist, menstrual cycle <28d or> 32d, B-estimated gestational weeks should be subtracted or added to the number of days in advance or postponement of menstruation.