COMPUTE

• EDC


  Expected Date of Confinement or Delivery
• Naegele's Rule


  Calculation of EDC based on LMP (Last Menstrual Period) for women with regular menstrual period
• McDonald's Rule


  Calculation of EDC based on fundic height for women with irregular menstrual period
• Naegele's Rule


  1. Go back 3 months from LMP

  2. Add 7 days

  3. Add 1 to the year
• Naegele's Rule (for LMP Jan 1 to Mar 24)

  1. Add 9 months

  2. Add 7 days
• Steps in Measuring Fundic Height

  1. Empty bladder

  2. Dorsal recumbent position

  3. Measure from symphysis pubis to uterine fundus
• AOG


  Age of Gestation
• McDonald's Rule - Compute AOG in Months

  Fundic height (cm) x 2/7 = AOG in months
• McDonald's Rule - Compute AOG in Weeks

  Fundic height (cm) x 8/7 = AOG in weeks
• Gestational Age


  Calculated from first day of last menstrual period, not date of conception
• Birth normally occurs at 37-42 weeks gestation, before 37 weeks is preterm
• Compute AOG in Weeks from LMP

  Count days from LMP to visit date, divide by 7
• Compute AOG in Months from Weeks

  AOG in weeks / 4 = AOG in months