Ultrasound Based Redating of a Normal Pregnancy Without Maternal OR Fetal Abnormality
NOTE: Third Trimester Ultrasound Based Due Date is Least Reliable and Requires Follow Up of Interval Growth.
Step 1. Calculate GA/EDD by LMP here.
Step 2. Calculate GA/EDD by FIRST ULTRASOUND here.
Step 3. Use the GA/EDD by US if the discrepancy between ultrasound dating and LMP is:
- Greater than 5 days before 9 0/7 weeks of gestation by LMP
- Greater than 7 days from 9 0/7 weeks to 15 6/7 weeks by LMP
- Greater than 10 days from 16 0/7 weeks to 21 6/7 weeks by LMP
- Greater than 14 days from 22 0/7 weeks to 27 6/7 weeks by LMP
- Greater than 21 days after 28 0/7 weeks by LMP
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Pregnancy Due Date Calculator
https://perinatology.com/calculators/Due-Date.htm
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Calculate Due Date From US Report
https://www.perinatology.com/calculators/EDDSono.htm
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Gestational Age on a Given Date for Induction of Labor OR C-Section
https://perinatology.com/Reference/Fetal%20development.htm
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Gestational Age from Ultrasound Measurements
https://perinatology.com/calculators/Estimation%20of%20Fetal%20Weight%20and%20Age.htm#AGECALC
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Pregnancy Wheel
https://www.prokerala.com/health/pregnancy/pregnancy-wheel/
First Trimester of Pregnancy: Less than14 weeks 0 days
Second Trimester of Pregnancy 14 weeks and 0 days through 27 weeks and 6 days
Third Trimester of Pregnancy 28 weeks 0 days through delivery
References: https://app.box.com/s/n14psxhkvo5owj4utbbbah92dc4gxl6l
