Estimated Date of Birth

Question 1

Nagle’s Rule

Answer 1

1) Determine first day of LNP
2) Subtract 3 months
3) Add 7 days

Question 2

Pregnancy “Wheels”

Answer 2

1) Determine first day of LNP, not considered to be the most accurate method b/c client may not recall exact date, not all wheels are made the same

Question 3

McDonald’s Method

Answer 3

Fetal age is based on fundal height measurement after 16 weeks. Fundal height in cm is equal to + or - 2 cm the age of the fetus in weeks

Question 4

1) How long is normal pregnancy if first day of LMP is known?
2) How long is normal pregnancy if day of conception is known?

Answer 4

1) 280 days

2) 266 days