Duration of pregnancy is 280 days or 40 weeks

Duration of pregnancy is 280 days or 40 weeks.

  • Naegle’s formula is used to calculate Expected date of delivery (EDD) from Last menstrual period (LMP). Add 7 days and count back 3 months from LMP. Only 4% of pregnant ladies deliver on EDD.

  • Total Antenatal visits 12-14.
    One visit every 4 weeks till 28 weeks.
    One visit every 2 weeks till 36 weeks.
    One visit every week till delivery.

  • Minimum ANC visits according to WHO are 4. (16 weeks, 24-28 weeks, 32 weeks, 36 weeks)

  • Daily oral Iron and Folic acid supplementation with 30-60 mg of elemental Iron and 400 micrograms (0.4mg) of folic acid is recommended for pregnant women to prevent maternal anaemia, puerperal sepsis, low birth weight and preterm birth.

  • Therapeutic dose of folic acid to prevent Neural tube defects is 4 mg (4000 mcg)

  • Best parameter to find Period of Gestation in
    1st trimester on USG is by Crown Rump Length,
    2nd trimester is by Biparietal Diameter,
    3rd trimester is by Femur Length.

  • Best time to do USG in pregnancy to rule out maximum congenital anomalies is level 2 scan at 18-20 weeks. It is also detailed survey of fetal anomaly, placental localization and integrity of cervical canal.

  • Johnson’s formula is used to find expected weight of the fetus clinically, This is calculated by (Fundal height in cm - 12) × 155 = weight in grams.