LMP full form is Last Menstrual Period. The LMP date is the first day of a woman's last menstrual period before pregnancy. It is used by doctors to calculate the Expected Date of Delivery (EDD) and gestational age of the baby. Using Naegele's Rule: EDD = LMP date + 9 months + 7 days (or + 280 days).
LMP full form = Last Menstrual Period.
LMP date used to calculate EDD (Expected Date of Delivery) and gestational age.
Naegele's Rule: EDD = LMP + 9 months + 7 days (or + 280 days).
Pregnancy is 40 weeks (280 days) counted from LMP date.
Gestational age = weeks elapsed since LMP.
Conception occurs ~2 weeks after LMP.
Full Form: Last Menstrual Period Hindi: अंतिम माहवारी (Antim Mahavari)
Why is LMP Important in Pregnancy? • Doctors use LMP to calculate:
Naegele's Rule — EDD Calculation from LMP: • EDD = LMP date + 9 months + 7 days • Or: EDD = LMP date + 280 days • Example: LMP = 1 January 2025 → EDD = 1 January + 9 months + 7 days = 8 October 2025
Gestational Age Calculation: • Gestational age = number of weeks since LMP • Example: LMP = 1 January; current date = 1 March → Gestational age ≈ 8–9 weeks
Why LMP and Not Conception Date? • Conception happens ~2 weeks after LMP • LMP is easier for women to track • Doctors use LMP as a standardised reference point
Trimester Timeline from LMP:
| Trimester | Weeks from LMP |
|---|---|
| First Trimester | 1–12 weeks |
| Second Trimester | 13–27 weeks |
| Third Trimester | 28–40 weeks |
Other Information About LMP: • If cycle is irregular, ultrasound is used to confirm gestational age • Ultrasound in first trimester (7–12 weeks) is most accurate for dating • Early ultrasound may adjust EDD if different from LMP-based calculation
LMP full form is Last Menstrual Period — the first day of a woman's last menstrual period before pregnancy. Doctors use the LMP date to calculate the Expected Date of Delivery (EDD) using Naegele's Rule: EDD = LMP + 9 months + 7 days (or + 280 days). Gestational age is also counted from the LMP date.
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