Pregnancy test dating
The expected duration of a pregnancy is 40 weeks from the first day of LMP (four weeks more than the traditional nine months by which many count).Medical professionals consider delivery premature when it occurs before 36 weeks, and extremely premature when it occurs before 28 weeks’ LMP.If the ultrasound estimate differs by more than one week from the LMP, we would use the ultrasound estimate for the due date.
Also, when providers all use the same LMP date, we are using one system that provides a standard convention.An ultrasound may detect fetal demise or other signs that your pregnancy is not progressing normally.When a menstrual period is late, a woman may use a home pregnancy test to determine whether she is pregnant.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.
Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.