Which abbreviation represents Last Menstrual Period?

• A. Last Menstrual Period
• B. Last Normal Menstrual Period
• C. Last Monthly Period
• D. LMP

Answer: (D)

Understanding common obstetric abbreviations. Last Menstrual Period is routinely abbreviated as LMP in medical records. This shorthand is used to anchor the dating of a pregnancy and calculate the due date, since the first day of the last menstrual period is the standard reference point for gestational age. The other options spell out phrases in full and aren’t standard abbreviations used in clinical notes. There isn’t a widely accepted abbreviation for those phrases. Clinically, LMP is paired with methods like Nagele’s rule to estimate gestational age and due date.