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Related Experiment Videos

Diagnostic problems associated with cystinuria.

M Ala-Opas1, I Sipilä, S Kivinen

  • 1Kanta-Häme Central Hospital, Hämeenlinna, Finland.

Scandinavian Journal of Urology and Nephrology
|January 1, 1990
PubMed
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Elevated urinary cystine is uncommon in kidney stone patients. This study found few stone formers had cystinuria, suggesting other factors are more prevalent in stone development.

Area of Science:

  • Nephrology
  • Urology
  • Biochemistry

Background:

  • Urinary stones are a common condition with diverse etiologies.
  • Cystine stones, a specific type of urinary calculus, result from the genetic disorder cystinuria.
  • Understanding the prevalence of elevated urinary cystine is crucial for diagnosing and managing stone disease.

Purpose of the Study:

  • To investigate the clinical significance of urinary cystine concentration in the general population of kidney stone formers.
  • To determine the frequency of cystinuria and its association with different types of urinary stones.

Main Methods:

  • A prospective study evaluating 190 patients diagnosed with urinary stones.
  • Analysis of urinary cystine concentrations and genetic testing for cystinuria.

Related Experiment Videos

  • Correlation of cystinuria status with stone composition and patient history.

    • Main Results:

    • Only 3.8% of patients were heterozygous and 0.5% were homozygous for cystinuria.
    • A small fraction (1%) of these patients formed cystine stones.
    • Two patients with calcium stones were found to be heterozygous for cystinuria, indicating a potential, albeit infrequent, link.

    Conclusions:

    • Elevated urinary cystine concentrations are relatively rare among patients presenting with urinary stones.
    • Cystinuria is an infrequent cause of kidney stone formation in the studied population.
    • Further research may be needed to explore the multifactorial nature of common urinary stone formation.