The expected date of delivery can be determined mathematically using Nagele's rule.Add nine months plus seven days to the first day of last mentural period.
For example,if the LMP is 14th March,2001 then the expected date of delivery is 21st December 2001.This rule is based for a normal 28 day cycle.
Note:In women with longer cycle,add to the 1st day of the LMP,the usual 7 days plus the number of days of that the cycle extends beyond 28 days. |