Pregnancy math can be a little murky. After all, unless you went the IVF-route, your physician has no way of knowing the exact time of conception. Because of this, pregnancy is calculated from the first day of your last menstrual period or LMP.
The anticipation of knowing exactly when your baby will be born is exciting. When a physician determines your due date, however, it's not always a guarantee of the day your child will be born. Due dates are determined based on a number of factors, including your menstrual cycles and the baby's measurements, which can predict your baby's expected date of delivery within a week or two. Due dates are accurate if you have regular monthly periods; obstetricians often calculate the due date based on the first day of a woman's last menstrual period, says Dr.
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A podcast about pregnancy and drug use, Native people and tribal sovereignty. Medical professionals use a standard set of up to three methods to date pregnancies: last menstrual period, ultrasound, and a physical exam. That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.
A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception.
The date your baby is due—your estimated due date EDD —is calculated from the first day of your last menstrual period LMP. An ultrasound exam often is used to confirm the due date. Your obstetrician—gynecologist ob-gyn will evaluate the dating from your ultrasound exam and compare it with your due date based on your LMP.
As its name suggests, the main purpose of a dating scan is to check how advanced the pregnancy is and therefore when the baby is due. Measuring the baby can be more accurate than dating by the last menstrual period. It is also an opportunity to check the baby is alive and developing as expected, and check for twins.