Last menstrual period

(LMP) The first day of last menstrual period, the date that is used to calculate the 40 weeks of pregnancy and a woman's due date. See Naegele's rule.
Found on https://www.whattoexpect.com/pregnancy/glossary

Last Menstrual Period

(LMP) This date is used to work out how many weeks pregnant you are. the count starts from the first day of your LMP.
Found on http://www.cmft.nhs.uk/saint-marys/our-services/maternity-services/glossary

Last menstrual period

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. A woman is therefore considered to be 6 weeks pregnant 2 weeks after her firs...
Found on http://www.medterms.com/script/main/art.asp?articlekey=13608

Last Menstrual Period

The calendar date of a woman's last menstrual period before fertilization occured. This is the point in time from which the pregnancy is measured and the due date is calculated. Synonym(s): LMP
Found on http://www.pregnology.com/Pregnancy-dictionary/
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