advice counseling dating man married - Dating by ultrasound

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Dating by ultrasound

When people discuss how far along in pregnancy someone is, they tend to do so in general terms: “She’s in the first trimester” or “She’s four months along.” However, many people have only a vague idea of what those phrases really mean.

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.

However, the timing of the actual delivery is not so predictable.

Medical professionals consider delivery premature when it occurs before 36 weeks, and extremely premature when it occurs before 28 weeks’ LMP.

It is also important to note that the phrase “late-term,” popularly used by the media to describe later abortions, has no medical meaning and is not used in any medical documentation.

The second trimester extends from the end of the first until about 26 to 28 weeks from the LMP, and the third trimester from the end of the second until delivery.

Ultrasound Dating Ultrasound can be used to date pregnancies, especially when the LMP is not known (for example, pregnancy after a delivery but before a menses occurred or irregular menses without predictable ovulation).

During a pelvic exam, the uterus can be felt coming over the pubic bone at about 12 weeks’ LMP and at the umbilicus (navel) at about 20 weeks.

The uterus then typically rises above the navel at about a centimeter a week after that.

For example, if in the first trimester the ultrasound estimate falls within one week of the LMP estimate, we still use LMP to determine due date and length of pregnancy.

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