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Are changes in urinary parameters during pregnancy clinically significant?

Sefa Resim1, Resim Sefa, Hasan Cetin Ekerbicer

  • 1Department of Urology, KSU Medical School, Kahramanmaras, Turkey. safaresim@ksu.edu.tr

Urological Research
|April 15, 2006
PubMed
Summary

Pregnancy can cause temporary hypercalciuria (high urine calcium), but increased urinary citrate and magnesium likely prevent kidney stone formation. These urinary changes typically normalize postpartum.

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Area of Science:

  • Nephrology
  • Obstetrics and Gynecology
  • Urology

Background:

  • Urinary stone formation is a concern during pregnancy.
  • Understanding physiological changes in urine composition during pregnancy is crucial.

Purpose of the Study:

  • To objectively assess changes in urinary parameters and calcium oxalate (CaOx) saturation during pregnancy.
  • To evaluate the reversibility of these changes postpartum.

Main Methods:

  • Prospective study of 15 healthy pregnant women.
  • Collection of 24-hour urine samples and blood samples across three trimesters and 3 months postpartum.
  • Analysis of urinary calcium, oxalate, and citrate levels.

Main Results:

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  • Pregnant women exhibited hypercalciuria throughout gestation.
  • Urine calcium levels were significantly higher in the second and third trimesters compared to postpartum.
  • Urine oxalate levels were higher postpartum than during pregnancy.
  • Urine citrate levels were elevated during pregnancy, returning to normal postpartum.

    • Conclusions:

    • Hypercalciuria during pregnancy appears to be a reversible physiological condition.
    • Increased urinary citrate and magnesium during gestation may inhibit stone formation.
    • Pregnancy alone may not significantly predispose women to urinary calculi formation without other risk factors.