Naegele's rule for expected date of delivery
Add seven, minus three
Gives a quick estimate of the due date at the first visit.
Assumes a regular 28-day cycle; ultrasound dating overrides it when there is a mismatch.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.
Add seven, minus three. It helps you recall: Naegele's rule for expected date of delivery.
Add 7 days to the first day of the last menstrual period
Subtract 3 months (or add 9)
Add seven: Add 7 days to the first day of the last menstrual period; Minus three: Subtract 3 months (or add 9).
It belongs to Antenatal care in OBG.
Assumes a regular 28-day cycle; ultrasound dating overrides it when there is a mismatch.
Gives a quick estimate of the due date at the first visit.
Say it aloud, write it from memory tomorrow, then again in a week. Then test yourself on a OBG question about Antenatal care.
It is a teaching aid written or adapted by our team. Some resemble ones students share informally. Check any fact that matters in a standard source.