计算孕妇的预产期,通常是以末次月经的月份加9或减3,日数加7的方法。但因1年中的12个月里,有28、30或31日的时候,并且润年时,2月份则为29日。故按此方法计算,其结果必然有时不准确。若欲知道准确的妊娠周数,必须按口、按月计算,比较麻烦。我们设计了一种妊娠周数及预产期简易表,经妇产科临床应用后,医护人员反映使用此表方便、准 Calculate the expected date of pregnancy, usually in the last month of menstruation plus 9 or minus 3, the number of days plus 7 method. However, because of 12 months in a year, there are 28, 30 or 31 days, and when the wet age, February is 29. Therefore, according to this method of calculation, the result is inevitable sometimes inaccurate. If you want to know the exact number of pregnancy weeks, you must press the mouth, calculated on a monthly basis, more trouble. We designed a simple gestational weeks and pre-production schedule, the clinical application of obstetrics and gynecology, medical staff reflect the use of this table easy, accurate