Last Menstrual Period (LMP)

Definition - What does Last Menstrual Period (LMP) mean?

The last menstrual period (LMP) refers to the start date of a woman’s most recent menstruation, or period as indicated by the first day of bleeding. The date and duration of the last menstrual cycle can provide important insight, including when the next menstrual period will occur, the time frame in which a woman is fertile and ovulating, or if pregnant, the approximate due date and gestational age of the fetus.

FertilitySmarts explains Last Menstrual Period (LMP)

The first day of bleeding in a woman’s period is notable as it is the date used to track her upcoming ovulation and to calculate the length of her cycle. Understanding this cycle and awareness of its stages, known as fertility awareness, is an effective way to increase the odds of conceiving through intercourse.

The more accurately a cycle is tracked and charted, the more precisely ovulation days can be identified. Additionally, if infertility problems are present, this awareness will assist a physician in diagnosing any issues.

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