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Updated: Mar 24, 2026
Murine Fetal Echocardiography
Published on: February 15, 2013
Improving the ultrasound detection of isolated fetal limb abnormalities
Maria Andrikopoulou1, Sevan A Vahanian2,3, Martin R Chavez2
1a Department of Obstetrics and Gynecology , Winthrop University Hospital , Mineola , NY , USA.
Insights
A detailed ultrasound protocol significantly improves the prenatal detection of isolated fetal limb abnormalities, more than doubling the current rates. This enhanced imaging approach offers high accuracy and minimal extra time.
Area of Science:
- Medical Imaging
- Prenatal Diagnosis
- Fetal Medicine
Background:
- The prenatal detection rate for isolated fetal limb abnormalities is historically low, ranging from 4% to 29.5%.
- Accurate prenatal diagnosis is crucial for appropriate management and counseling.
Purpose of the Study:
- To evaluate the accuracy of a detailed ultrasound protocol in identifying isolated fetal limb abnormalities.
- To determine if an enhanced ultrasound approach can improve detection rates.
Main Methods:
- Retrospective analysis of infants with isolated limb defects born between 2009 and 2014.
- Review of antepartum and postpartum records, including genetic testing results.
- Detailed imaging protocol focusing on upper and lower extremities, including bones, digits, and functional assessment.
Main Results:
- The detailed protocol achieved a detection rate of 69% (36 out of 52 neonates).
- The protocol demonstrated 100% specificity, 100% positive predictive value, and 99.8% negative predictive value.
- The additional time required for the detailed protocol was less than 5 minutes for a second-trimester sonogram.
Conclusions:
- A detailed ultrasound evaluation of fetal limbs significantly enhances prenatal detection rates.
- This protocol offers a substantial improvement over previously reported detection rates with minimal additional time investment.
Objective:
The prenatal detection rate of isolated fetal limb abnormalities ranges from 4 to 29.5%. Our aim was to determine the accuracy of a detailed ultrasound protocol in detecting isolated fetal limb abnormalities Methods: This is a retrospective study of infants born at our institution with isolated limb defects from 2009 to 2014. Antepartum and postpartum records were reviewed for genetic testing results. We routinely image both upper and lower extremities, including all long bones, hands, feet, fingers and toes. Posturing, muscular tone and movement are also noted.
Results:
During the study period, there were 52 neonates born with isolated fetal limb abnormalities who had received a fetal anatomic survey in our ultrasound unit and 15 930 sonograms performed with normal findings; 36 out of the 52 had been prenatally diagnosed (detection rate 69%). The specificity of the protocol was 100% as there were no false positive cases, the positive predictive value was 100% and negative predictive value 99.8%. Forty-three of 52 neonates had normal genetic testing either prenatally or postnatally; 9 neonates did not undergo genetic testing. The average additional time required for this detailed protocol was <5 min for second trimester sonogram.
Conclusion:
A minimal investment in time for detailed evaluation of fetal limbs more than doubles the previously reported prenatal detection rate.
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