What it means
The date a baby is expected to be born, 40 weeks (280 days) after the start of the last menstrual periodlast MEN-stroo-ul PEER-ee-udThe first day of a person's most recent menstrual period.Full entry (LMP). It is often worked out with Naegele's rule: take the first day of the LMP, add 7 days, subtract 3 months and add 1 year. An early ultrasound may adjust it. Older names are EDC (estimated date of confinement) and EDB (estimated date of birth). Only a few babies arrive on the exact day.
In a chart
"LMP May 10; EDD February 17 of next year by Naegele's rule."
Remember it
Naegele: LMP plus 7 days, minus 3 months, plus 1 year.
At a glance
| Spanish | fecha probable de parto (FPP) |
|---|---|
| Also written | Estimated date of delivery, EDB, estimated due date, EDC |
Related terms
prenatal care
Health care for a pregnant person and the unborn baby during pregnancy, before birth.
pregnancy
The time during which an embryo, then a fetus, develops inside the uterus, from conception to birth.
last menstrual period
The first day of a person's most recent menstrual period.