|
妊娠
|
|
妊娠的开始
|
|
随着迁移致子宫内的胚泡植入子宫内膜（也就是受精卵发育到确定的阶段时），妊娠就开始了；在正常情形下，约于9个月后，随着宝宝的诞生妊娠也就结束了。然而，为了临床计算方便起见，妊娠的开始不是从胚泡植入时的那一天算起，而是从最后一次月经的第一天起算。（因为孕妇识别不了胚泡植入，却通常能够回忆起她最后一次月经的日期。）按照所推算的这个时间表，她将在280天后生下宝宝。利用相同的计算原理，分娩日期也可以凭经验作出预报：“月减3，日加7”。 |
|
如何计算预产期：“月减3，日加7”
举
例：
|
|
|
最后一次月经的第一天:
十二月十日，或用数字表示：月份数12；日期数为10。
|
预产月份：
|
12
|
-
|
3
|
=
|
9
|
|
预产日期：
|
10
|
+
|
7
|
=
|
17
|
|
预产日期:
结果对照：月份数为9，日期数为17；也就是9月17日。
|
|
|
Pregnancy
|
|
The Beginning of Pregnancy
|
|
A woman's pregnancy begins with the implantation of a blastocyst (i.e. the fertilized egg in a certain stage of development) in her uterus and, under normal conditions, ends about nine months later with the birth of a baby. However, for certain purposes of medical calculation the beginning of pregnancy is not dated from the time of implantation, but from the first day of the last menstruation. (The reason for this is that a woman is not aware of an implantation, but usually can recall the date of her last menstruation.) According to this timetable, the woman will give birth 280 days (40 weeks) later. Using the same basis for calculation, the date of delivery can also be predicted by this rule of thumb: "Month minus 3, day plus 7.”
|
|
How to calculate the day of delivery: “Month - 3, day + 7”
Example:
|
|
|
First day of last
menstruation:
December 10, or, in numerals, month no. 12, day no. 10.
|
Month of
delivery:
|
12
|
-
|
3
|
=
|
9
|
|
Day of
delivery:
|
10
|
+
|
7
|
=
|
17
|
|
Date of
delivery:
Month no. 9, day no. 17, i.e. September 17. |
|
