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Related Experiment Videos

Development of a fetal renal function test using endogenous creatinine clearance.

N S Adzick, M R Harrison, A W Flake

    Journal of Pediatric Surgery
    |December 1, 1985
    PubMed
    Summary

    Fetal creatinine clearance (CrC) accurately measures glomerular filtration rate (GFR) in fetal kidneys with obstructive uropathy. This simple test aids in assessing renal damage and predicting recovery, improving diagnosis and management.

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    Area of Science:

    • Perinatal Medicine
    • Fetal Urology
    • Renal Physiology

    Background:

    • Accurate assessment of fetal renal damage is crucial for managing obstructive uropathy.
    • Predicting renal function recovery after relieving obstruction requires reliable fetal renal function tests.

    Purpose of the Study:

    • To determine if endogenous fetal creatinine clearance (CrC) accurately reflects glomerular filtration rate (GFR) in obstructed fetal kidneys.
    • To compare fetal CrC with a standard GFR measurement, iothalamate clearance (IC).

    Main Methods:

    • Six fetal lambs underwent unilateral ureteral ligation.
    • Renal function was assessed via split urine collections to measure CrC, IC, and fractional sodium excretion.
    • Obstructed kidneys were compared to contralateral unobstructed control kidneys.

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    Main Results:

    • Excellent correlation was found between fetal CrC and IC (r = 0.997, P < 0.001).
    • Obstructed fetal kidneys showed significantly decreased GFR compared to controls.
    • Abnormal tubular function with marked sodium loss was observed in obstructed kidneys.

    Conclusions:

    • Endogenous fetal CrC is a reliable indicator of GFR in the obstructed fetal kidney.
    • CrC offers a simple, quantitative method for assessing fetal renal function.
    • This test can enhance the diagnosis and management of fetal obstructive uropathy.