Routine third-trimester ultrasound assessment for intrauterine growth restriction

Area of Science:

• Perinatology
• Fetal Medicine
• Obstetrics

Background:

• Intrauterine growth restriction (IUGR) significantly affects perinatal outcomes, with undetected cases posing higher risks.
• Current methods like symphysis-fundal height measurement have limitations in accurately detecting abnormal fetal growth.
• Routine third-trimester ultrasounds show improved detection rates but lack robust evidence for enhanced perinatal outcomes.

Purpose of the Study:

• To review the effectiveness of different methods for assessing fetal growth and detecting IUGR.
• To evaluate the evidence supporting routine ultrasound screening versus symphysis-fundal height measurements.
• To discuss the utility of various fetal growth parameters and growth chart standards.

Main Methods:

• Literature review and synthesis of existing evidence on fetal growth assessment techniques.
• Analysis of studies comparing symphysis-fundal height measurement with routine third-trimester ultrasounds.
• Evaluation of the performance of different fetal biometry formulas and growth chart types.

Main Results:

• Abdominal circumference alone is comparable to estimated fetal weight for assessing fetal growth.
• Hadlock formulas provide accurate fetal weight estimation across various gestational ages and settings.
• Prescriptive growth standards are preferred over descriptive ones; customized standards show potential but lack conclusive evidence.

Conclusions:

• While routine ultrasounds enhance IUGR detection, high-quality evidence linking them to improved perinatal outcomes is insufficient.
• Longitudinal fetal growth assessment shows promise for predicting adverse outcomes, but requires more randomized trial evidence.
• Further research is needed to establish definitive evidence-based strategies for optimal antenatal detection and management of IUGR.