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An OB GYN will use a combination of charts or computer applications in combination with a womans average cycle length to calculate the due date. They will also take into account the amount of time since the woman's last cycle.

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10y ago
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6mo ago

An OBGYN typically calculates a woman's due date based on the first day of her last menstrual period (LMP) and the average length of her menstrual cycles. This method assumes that conception occurs about two weeks after the start of the menstrual cycle. The due date is calculated by adding 280 days (or 40 weeks) to the first day of the LMP.

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Q: How does an OBGYN calculate one's due date in pregnancy?
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