American College of Obstetricians and Gynecologists. Conceptional age, menstrual age, and ultrasound age: Initially it was May 3, but now it's looking more like April 27, which has lined up with scans at 9 weeks, 13 weeks, and 21 weeks. Committee Opinion No. Dating scan is more accurate because of ovulation if I went off lmp my due date would be ten days earlier then it is now but because I must have ovulalted late it's two weeks from my lmp. J Jbean
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Women's Health Care Physicians
Oh ok. Goldberg, MD; and Yasser Y. Ultrasonography dating in the second trimester typically is based on regression formulas that incorporate variables such as the biparietal diameter and head circumference measured in transverse section of the head at the level of the thalami and cavum septi pellucidi; the cerebellar hemispheres should not be visible in this scanning plane the femur length measured with full length of the bone perpendicular to the ultrasound beam, excluding the distal femoral epiphysis the abdominal circumference measured in symmetrical, transverse round section at the skin line, with visualization of the vertebrae and in a plane with visualization of the stomach, umbilical vein, and portal sinus 8 Other biometric variables, such as additional long bones and the transverse cerebellar diameter, also can play a role. Because of the risk of redating a small fetus that may be growth restricted, management decisions based on third-trimester ultrasonography alone are especially problematic; therefore, decisions need to be guided by careful consideration of the entire clinical picture and may require close surveillance, including repeat ultrasonography, to ensure appropriate interval growth. With rare exception, if a first-trimester ultrasound examination was performed, especially one consistent with LMP dating, gestational age should not be adjusted based on a second-trimester ultrasound examination. Radiology ;
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