1. BASIC TERMS AND
CONCEPTS IN
OBSTETRICS
Dr Farzana Kazmi
Assistant Professor
DHQ Teaching Hospital Rawalpindi
2. Calculation of EDD :
Naegle’s Rule
Add 7 days and 9 months /
Add 7 days and subtract 3 months in LMP
Total Gestation:
Forty weeks
280 days
Viability: The ability of fetus to survive in the
extra uterine environment
after 20 , 24, 28 weeks of gestation or
weight > 500 grams
3.
Term: After complete 36 weeks
till complete 41 weeks of
gestation
Preterm: Before complete 36 weeks
Postdate: After EDD or complete 39
weeks till complete 41
weeks
Postterm After complete 41 weeks
4. Estimation of birth weight
Low birth weight: ( LBW):
Babies who born weighing less than
2,500 grams
Very low birth weight:
Babies who are born weighing less
than 1,500 grams
(3 pounds, 4 ounces).