Systematic assessment of the impact of routine third-trimester ultrasound examination has provided robust estimates of its diagnostic accuracy for various fetal anomalies, as well as some adverse perinatal outcomes. Read the latest Practice Guideline to find out more.

This new Practice Guideline makes recommendations for conducting third-trimester ultrasound examinations and is free to download. It addresses:

  • The determination of placental location and fetal presentation, measurement of fetal biometry, identification of fetal anomalies, evaluation of amniotic fluid volume and documentation of fetal and uterine artery Doppler findings.
  • Third-trimester screening for small-for-gestational age and macrosomia.
  • The gestational age at which the routine third-trimester ultrasound scan should be performed.
  • Situations such as suspected vasa previa, or the combination of low-lying placenta and previous Cesarean section, in which additional steps and detailed assessment should be included in the third-trimester ultrasound scan.

Practice Guidelines

The ISUOG Practice Guidelines have been developed, with the ISUOG Clinical Standards Committee (CSC), to improve and standardise medical care for our ultrasound in OBGYN speciality. View all ISUOG Practice Guidelines  


20% off online journal membership

If you enjoy reading Ultrasound in Obstetrics & Gynecology, why not sign up for a Journal Membership? Subscribe by 31 January 2024 and get:

  • 20% off your journal subscription using the discount code 2024JOURNAL
  • Full, uninterrupted access to the online journal
  • All the benefits of standard ISUOG membership


Advanced course: Third Trimester through Ultrasound, 17 March 2024. Livestream

Join us on Sunday 17 March 2024, for our advanced education course which focuses on the new ISUOG Practice Guideline.

Led by Prof. Asma Khalil and Prof. Alexandros Sotiriadis, the course will be a great opportunity to hear from some of the Guideline’s contributing authors.  Read more and register to update your knowledge and improve your understanding of the practical applications of the Guideline.