The first phase of the menstrual cycle is called the follicular phase. Throughout pregnancy, you might see this date on your paperwork listed as âLMP.â A menstrual cycle starts with the first day of the period, a date that healthcare providers refer to as the âlast menstrual periodâ. Your LMP can be an important milestone for your pregnancy. Īlthough the age of pregnancy based on ultrasound measurements is more accurate than the age of pregnancy based on LMP, both are estimates and not definitive statements. LMP formulas are not suitable in several situations including the following: LMP is not known or is not certain, birth control pills were taken in the two months before LMP, the menstrual cycle is irregular, you are carrying multiples. Your pregnancy may also be dated by ultrasound measurement if an LMP formula was not appropriate for your pregnancy for any reason. If there is a significant difference between gestational age according to LMP and gestational age according to the ultrasound, you may be given a new gestational age and due date based on the ultrasound measurements. During the scan, baby is measured and the age of pregnancy is estimated by comparing baby’s size against recorded averages. Ultrasound in the first trimester is the most accurate method of dating pregnancy. Third-trimester ultrasounds are generally used for pregnancy dating only if a pregnant person does not have an ultrasound until the third trimester and the date predicted by the ultrasound is three weeks or more off from the due date estimated. Third-trimester ultrasounds are not recommended for pregnancy dating, but in some cases, they may be the only measurement available. Ultrasounds are still considered accurate at predicting birth date if performed before 22 weeks of gestational age. When pregnant people have dating scans in and between weeks 11-14, about 70% will birth close to their estimated due date. Ultrasounds performed early in pregnancy may be called âdating scansâ by your healthcare provider because they look at the size of several different parts of the fetus to determine its approximate gestational age. Research suggests that the most accurate time for an ultrasound is between 11-14 weeks gestational age. Ultrasounds, also called sonograms or sonos, can be more accurate than LMP at predicting the date of birth if performed early in pregnancy. This is because of two reasons: estimating gestational age is a varied and complicated process and pregnancies naturally vary from person to person and pregnancy-to-pregnancy. Pregnancy Tips : How to Calculate the Due Date From the Date of ConceptionĪbout 4-5% of women and pregnant people birth on their estimated due date.
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