Obstetric dating accuracy
Gestational age by four ultrasonic parameters (biparietal diameter, head circumference, abdominal circumference, and femur length) was calculated for 210 normal obstetric patients divided into four gestational age groups based on time of first ultrasound examination.
Accuracy of the calculations was determined by comparison of each technique and a simple arithmetic average of the four techniques to the gestational age calculated from the Dubowitz examination of the neonate after delivery.
Women who participated in the study were selected on following criteria: Regular menstrual cycles, known date of last menstrual period and previous live normal neonates in multipara.
All scans were performed by a single ultrasonologist on one ultrasound machine.
Very high frequency sound waves of between 3.5 to 7.0 megahertz (i.e.
3.5 to 7 million cycles per second) are generally used for this purpose.
Ask your GP if you want to have one anyway for extra reassurance, as she may be able to refer you.
The American College of Obstetricians and Gynecologists state the following: “Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks gestation) is the most accurate method to establish or confirm gestational age” (Committee Opinion, No. Even though using your last period date (LMP) is a traditional dating method, the accuracy of this practice depends on a regular menstrual cycle of 28 days, with ovulation occurring on the 14th day of the cycle.Our ultrasounds are performed by licensed ultrasound technicians under the direction of obstetricians.We can come along side you to give you the information you need about your pregnancy to make an informed and empowered decision about abortion. [email protected] Copyright © 2014 by authors and Scientific Research Publishing Inc.This work is licensed under the Creative Commons Attribution International License (CC BY). Received 27 June 2014; revised 28 July 2014; accepted 28 August 2014ABSTRACTRapid and accurate determination of gestational age (GA) may be vital to the appropriate care of the critically ill pregnant patient and improve obstetric care through allowing the optimal timing of necessary interventions and the avoidance of unnecessary ones.