Category: LMP

Measuring Gestational Age in Vital Statistics Data: Transitioning to the Obstetric Estimate

Beginning with the 2014 data year, NCHS is transitioning to a new standard for estimating the gestational age of a newborn. The new measure, the obstetric estimate of gestation at delivery (OE), replaces the measure based on the date of the last normal menses (LMP). This transition is being made because of increasing evidence of Read More >