Which item on the color Doppler ultrasound report can determine the days of pregnancy?

Patient's question:

How can the ultrasound report determine the days of pregnancy?

Doctor's answer:

Through the ultrasound report, the date of conception can be roughly estimated, but a two-week difference before or after is within the normal range. This is because the pregnancy duration can be calculated based on the gestational sac diameter. However, since the development speed of the gestational sac varies, only an approximate date of conception can be estimated, and the exact date cannot be determined. It is recommended to rest well first, avoid excessive fatigue, relax your mood, eat more fresh vegetables and fruits, supplement nutrition, and prepare for prenatal examinations.

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