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Initial Assessment Folic acid (400-800 mcg/day) is vital to prevent neural tube defects. The initial prenatal visit establishes the Estimated Date of Delivery (EDD) using Naegele’s Rule: subtract 3 months from the first day of the last menstrual period (LMP), add 7 days, and add 1 year. Obstetric history uses the GTPAL acronym: Gravida (total pregnancies), Term (>38 weeks), Preterm (>20 but <37 weeks), Abortions (<20 weeks), and Living children. Physical assessment includes estimating pelvic adequacy by measuring the diagonal conjugate; a measurement ≥12.5 cm indicates the pelvic inlet is adequate.