How to calculate the exact gestational age according to the date of intercourse

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Hello doctor! Can you advise me on how to calculate the exact age of the fetus according to the date of intercourse or by any method with the least error? I would like to thank the doctor.
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Dear friend! Gestational age in relation to the date of intercourse is a classical calculation method, with much lower accuracy than the ultrasound method, and the calculation of gestational age is only absolutely accurate in the case of IVF due to the date of embryo transfer.
In practical obstetrics, gestational age is calculated from the first day of the menstrual cycle (ie 2 weeks before ovulation) Example: Today is August 14, 2020, a woman's last menstrual period is On July 3, 2020, the current gestational age will be 6 weeks and the likely date of ovulation will be July 17, 2020.
If you know the exact date of intercourse and only have sex once within 3-4 weeks, the gestational age will be calculated by 2 weeks from the date of intercourse. However, as the doctor said above, the accuracy of this method is not high.
Thank you for trusting and sharing your questions about the exact gestational age calculation with Vinmec Health System. Wish you good health.

Trắc nghiệm: Sự thay đổi nồng độ beta HCG thay đổi theo tuổi thai

hCG là một hormon quan trọng được tiết ra khi phụ nữ mang thai. Nồng độ beta hCG được tính theo đơn vị mUI/ml. Hãy cùng theo dõi bài trắc nghiệm sau đây để biết được Nồng độ beta HCG thay đổi theo tuổi thai như thế nào?

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Answered by Specialist Doctor II Nguyen Thu Hoai - Unit Head of Obstetrics and Gynecology Clinic - Obstetrics Department - Vinmec Times City International Hospital
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