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What does " LMP " mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term. " LMP " stands for "Last Menstrual Period." It is a term used in medicine to refer to the first day of a woman's most recent menstrual cycle. Learn what LMP stands for in medical settings and how it’s used in pregnancy, period tracking, and fertility care. The complete form of LMP Pregnancy is Last Menstrual Period Pregnancy. It is a standard method used by healthcare professionals to estimate the gestational age of a pregnancy. LMP: Abbreviation for " last menstrual period ." By convention, pregnancies are dated in weeks starting from the first day of a woman's last menstrual period (LMP). If her menstrual periods are regular and ovulation occurs on day 14 of her cycle, conception takes place about 2 weeks after her LMP.