Tuesday, February 22, 2011

How to estimate gestation age

  • From the Last menstrual period (LMP)and using Nagle's rule
- Provided the menses is regular
- Need to adjust if usual period is more or less than 28 days
  • Using Ultrasound scan
- Measuring the crown rump length (week 7 to week 14)
- Parietal diameter or femur length (Week 14 to week 20)
- Not useful for dating beyond 20 weeks
- More accurate than LMP

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