| Abstrakt: |
First-trimester biochemistry First-trimester screening efficacy is improved by combining ultrasound-based NT measurement with assessment of maternal free -hCG and PAPP-A. Most national guidelines recommend combining these markers when screening for trisomies 21, 18 and 13. The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) is a scientific organization that encourages sound clinical practice and high-quality teaching and research related to diagnostic imaging in women's healthcare. Similar screening efficacy for trisomy 21 was reported in a second, national, screening program[78]. Biparietal diameter and head circumference Biparietal diameter (BPD) and head circumference are measured in the largest symmetrical axial view of the fetal head (Figure 1b). Ultrasound Obstet Gynecol 2003; 22: 63 - 66. 39 Suresh S, Sudarshan S, Rangaraj A, Indrani S, Cuckle H. Spina bifida screening in the first trimester using ultrasound biparietal diameter measurement adjusted for crown-rump length or abdominal circumference. [Extracted from the article] |
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