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Ultrasonography01:17

Ultrasonography

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During an ultrasonography procedure, a handheld device called...
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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
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Updated: May 20, 2025

Murine Fetal Echocardiography
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Murine Fetal Echocardiography

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Routine 36-week scan: diagnosis of fetal abnormalities.

A Syngelaki1,2, R Mitsigiorgi1, J Goadsby1

  • 1Fetal Medicine Research Institute, King's College Hospital, London, UK.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|March 25, 2025
PubMed
Summary
This summary is machine-generated.

A routine 36-week ultrasound detects new fetal abnormalities in 0.77% of pregnancies. Early detection of these conditions can improve postnatal outcomes.

Keywords:
fetal abnormalityprenatal diagnosispyramid of pregnancy carethird‐trimester screeningultrasound examination

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Last Updated: May 20, 2025

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Diagnostic Imaging

Background:

  • Routine ultrasound screening is crucial for fetal anomaly detection.
  • Previous scans at 12 and 20 weeks identify many abnormalities.
  • Late-term fetal abnormalities require further investigation.

Purpose of the Study:

  • To determine the incidence and types of fetal abnormalities identified at 36 weeks' gestation.
  • To identify abnormalities not diagnosed in earlier scans.
  • To report fetal anomalies diagnosed exclusively postnatally.

Main Methods:

  • Prospective study of 104,151 singleton pregnancies.
  • Routine ultrasound at 35-36 weeks' gestation.
  • Comparison with earlier scans at 11-14 and 19-23 weeks.
  • Exclusion of pregnancies with known aneuploidy.

Main Results:

  • Overall abnormality rate was 2.5%.
  • New abnormalities detected at 36 weeks occurred in 0.77% of cases.
  • Common new third-trimester findings included ovarian cysts and achondroplasia.
  • Postnatal diagnosis occurred in 0.39% of cases, with isolated cleft palate being most common.

Conclusions:

  • A significant proportion of fetal abnormalities are first detected at the 36-week scan.
  • Third-trimester diagnosis can guide management and potentially improve outcomes.
  • Further research into optimizing late-term anomaly detection is warranted.