Assessing gestational age by the due date - this is the method this calculator uses and runs on the following calculations:
Date of LMP = EDD - 280 days
GA = Current date - Date of LMP
where,
The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is
The table below shows the average age of infants delivered in the United States according to the number of fetuses being carried (plurality).
Singleton |
Twins |
Triplets |
Quadruplets |
Quintuplets and higher-order multiples |
|
Average Gestational Age (weeks) |
39 |
35 |
32 |
30 |
27 |
Clinical Examination
Doppler Ultrasonography
Human Chorionic Gonadotropin Pregnancy Test
Twins
You can calculate the gestational age of a baby:
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