It is also the appropriate methodįor calculating due dates when pregnancies result from artificial reproductive Not yet been performed or is not available. When to use the LMP formula: Despite its inherent weaknesses, the LMP formula is great for pregnancy dating when ultrasound has This canīe a little confusing since counting starts about two weeks before true pregnancy begins.īut it does provide a useful starting point for calculation of due dates and Normally known, the LMP formula begins counting pregnancy from the first day of a women's last menstrual period (LMP). Since the actual date of conception is not Obstetricians has issued recommendations which define when it isĪppropriate to use an LMP formula to calculate an EDD and when an ultrasound In the US, the American College of Gynecologists and The first trimester is the most accurate method for establishing or confirming aĭue date.
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