Patient's question:
[Condition Description: Last menstrual period was on January 1, 2010, calculated as estimated due date. Past treatment history and effectiveness: Desired help: My last menstrual period was on January 1, 2010. I want to know when my estimated due date is.]Doctor's answer:
The due date is generally calculated based on the first day of the last menstrual period. Subtract 3 months or add 9 months to the month, and add 7 days to the day. Alternatively, it can be calculated by adding 266 days to the conception date. From the time a fetus is born to when it leaves the mother's body and becomes a full-term newborn, it needs to live in the mother's uterus for 266 days. Therefore, if you know the exact conception date, simply adding 266 days will give you your due date. This method is more accurate than calculating based on the last menstrual period. In most cases, only 5% of babies are born on the exact due date, and most are born a few days earlier or later.