TY - CHAP M1 - Book, Section TI - Chapter 78. Second Trimester Obstetrical Ultrasound A1 - Usatine, Richard P. A1 - Smith, Mindy A. A1 - Chumley, Heidi S. A1 - Mayeaux, E.J. PY - 2013 T2 - The Color Atlas of Family Medicine, 2e AB - A 23-year-old pregnant gravida 2, para 1 woman is being seen for ultrasound because of her uncertain dates. Her best recollection of her last period gave her an estimated gestational age (EGA) of 19 weeks. Her vital signs are normal and her fundal height is 20 cm. Figures 78-1, 78-2, and 78-3 are still images taken from her ultrasound examination demonstrating an EGA of 21 weeks and 6 days by measurement of the baby's biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL). All four measurements allow the computer to calculate an estimated fetal weight of 431 g. The pregnancy proceeded without complications and the patient delivered a healthy boy at 403/7 weeks based on the ultrasound calculated estimated date of delivery. No interventions were needed for postdates because of the ultrasound calculations earlier in the pregnancy. SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=57675098 ER -