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Related Concept Videos

Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
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Imaging Studies II: Ultrasonography01:24

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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Ultrasound I: Abdominal Ultrasonography01:20

Ultrasound I: Abdominal Ultrasonography

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Introduction:
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
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Related Experiment Video

Updated: Sep 18, 2025

High Frequency Ultrasound for the Analysis of Fetal and Placental Development In Vivo
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High Frequency Ultrasound for the Analysis of Fetal and Placental Development In Vivo

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2nd trimester ultrasound (anomaly).

Ana Carocha1, Maria Vicente2, Joana Bernardeco1

  • 1Fetal Medicine and Surgery Unit, Unidade Local de Saúde São José, Lisboa, Portugal.

Best Practice & Research. Clinical Obstetrics & Gynaecology
|June 20, 2025
PubMed
Summary

The second-trimester ultrasound, performed between 18-24 weeks, is vital for assessing fetal health and detecting anomalies. Best practices ensure accurate prenatal screening and management, especially for high-risk pregnancies.

Keywords:
Biometric assessmentFetal anomalyMid-trimester screeningPrenatal ultrasoundStructural abnormalities

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Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Fetal Medicine

Background:

  • The second-trimester ultrasound is a cornerstone of prenatal care.
  • It is typically performed between 18 and 24 weeks of gestation.
  • This examination is critical for evaluating fetal anatomy, growth, and screening for mid-trimester anomalies.

Purpose of the Study:

  • To provide a comprehensive overview of best practices and guidelines for second-trimester ultrasound.
  • To emphasize the role of this scan in detecting fetal anomalies.
  • To discuss factors influencing scan accuracy and limitations.

Main Methods:

  • Review of established protocols for second-trimester ultrasound examinations.
  • Assessment of key fetal structures and biometric parameters for growth evaluation.
  • Evaluation of placental health, amniotic fluid levels, and cervical length for preterm birth risk.

Main Results:

  • The ultrasound assesses fetal anatomy, estimates fetal weight via biometric measurements, and evaluates placental and amniotic fluid status.
  • Cervical length measurement aids in assessing preterm birth risk.
  • Operator skill, equipment quality, and maternal factors like obesity can impact scan accuracy.

Conclusions:

  • The second-trimester ultrasound is an indispensable tool for pregnancy management, particularly in high-risk cases.
  • Despite limitations in detection variability, it provides crucial screening and diagnostic information.
  • Future advancements aim to enhance accuracy through improved technology, AI integration, and standardized protocols.