Fetal dating

If your healthcare provider uses an ultrasound to get an estimated delivery date to base the timing of your prenatal care, the original estimated gestational age will not be changed.

If there are any questions regarding gestational age, placenta location, or possible complications then more ultrasounds may be scheduled.

Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an expected date of conception.

However, many differences in each woman’s cycle may hinder the accuracy of the conception date calculation.

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Transvaginal scans may be used early in pregnancy to diagnose potential ectopic or molar pregnancies.

The viability of sperm varies as well, which means intercourse three to five days prior to ovulation may result in conception.

Ultrasound dating of conception is not reliable for determining paternity because the ultrasound can be off by at least 5-7 days in early pregnancy.

Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an estimated gestational age.

However, variations in each woman’s cycle and each pregnancy may hinder the accuracy of the gestational age calculation.

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