[Ultrasonic biometry of the fetal kidney]

Area of Science:

• Obstetrics and Gynecology
• Fetal Medicine
• Medical Imaging

Background:

• Accurate fetal assessment is crucial for monitoring pregnancy health and identifying potential complications.
• Established biometric parameters like biparietal diameter (BPD) and abdominal circumference are widely used.
• Novel approaches to fetal biometry can enhance diagnostic capabilities.

Purpose of the Study:

• To establish fetal renal biometry standards during pregnancy.
• To investigate the utility of renal dimensions in diagnosing fetal hypotrophy and anomalies.
• To explore fetal kidney volume as a predictor of fetal weight.

Main Methods:

• Renal biometry was performed on 1200 women, measuring three kidney dimensions via perpendicular scans.
• The ratio of kidney circumference to abdominal circumference was analyzed throughout gestation.
• Fetal kidney volume was calculated and correlated with fetal weight.

Main Results:

• A constant ratio between fetal kidney circumference and abdominal circumference was identified, useful for diagnosing fetal hypotrophy and anomalies.
• Fetal kidney volume demonstrated a correlation with fetal weight, enabling prognosis using a specific formula.
• The pelvis-to-kidney ratio was observed to be 1:3 to 1:4 in normal fetuses; a pelvis size >15 mm suggested obstructive uropathy.

Conclusions:

• Fetal renal biometry is a valuable tool for assessing fetal well-being and detecting developmental issues.
• Renal biometry parameters, particularly kidney volume, can be used for accurate fetal weight estimation.
• The study established normative data for fetal renal biometry, aiding in the diagnosis of various fetal conditions.