Test Entry – US Atlas (Library@ObG)
Key Points:
General Notes
- Exercise caution with gender discordance between NIPS and ultrasound
- NIPS is a screening test only
- Invasive testing (amniocentesis or CVS) is considered diagnostic
- Gender determination should be done using both mid-sagittal and axial views
Male
- Sagittal view
- Penis and scrotum should be seen below the cord insertion
- Axial view
- Inability to differentiate penis distinctly from scrotum on axial view should raise suspicion for hypospadias or ambiguous genitalia
Figure 48 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)
- Penis
- Scrotum
- Leg
Female
- Sagittal view
- In 2nd trimester, the mons pubis/female genitalia should appear flat
- Axial view
- Three distinct lines should be seen on axial view representing the labia
Figure 49 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)
- Bladder
- Mons pubis
- Umbilical cord
- Labia
- Thigh
Important to Note
- If ever in doubt as to whether findings are ‘within normal’, refer for specialized (also known as targeted or detailed) ultrasound
- ACOG/SMFM recommends offering invasive testing using microarray for fetal structural anomalies detected on prenatal ultrasound
Learn More – Primary Sources:
Callen’s Ultrasonography in Obstetrics and Gynecology, 6th edition, ISBN 9780323328340
Locate a Maternal Fetal Medicine Specialist:
Maternal-Fetal Medicine Specialist Locator-SMFM
The contents of the Site, such as text, graphics, images, information obtained from The ObG Project’s licensors, and other material contained on the Site (“Content”) are for informational purposes only. The Content is not intended to be a substitute for professional legal or medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of information you have read on the Site!
If you think you may have a medical emergency, call your doctor or 911 immediately. The ObG Project does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned on the Site. Reliance on any information provided by The ObG Project, The ObG Project employees, others appearing on the Site at the invitation of The ObG Project, or other visitors to the Site is solely at your own risk.
The Site may contain health- or medical-related materials that are sexually explicit. If you find these materials offensive, you may not want to use our Site.
Children’s Privacy
We are committed to protecting the privacy of children. You should be aware that this Site is not intended or designed to attract children under the age of 13. We do not collect personally identifiable information from any child we reasonably believe is under the age of 13.
