title: Diagnostic problems associated with cystinuria.
abstract: To elucidate the role of the urinary cystine concentration for the formation of urinary stones, 190 stone-formers were evaluated in this prospective study. Seven patients (3.8%) were heterozygous and one patient (0.5%) was homozygous for cystinuria; only two (1%) of them were cystine stone-formers. Two patients with calcium stones were heterozygous for cystinuria. This study confirms the observation that elevated concentrations of urine cystine are relatively infrequent among patients with urinary stones.
authors.affiliation: Kanta-Häme Central Hospital, Hämeenlinna, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Ala-Opas
authors.forename: I
authors.initials: I
authors.lastname: Sipilä
authors.forename: S
authors.initials: S
authors.lastname: Kivinen
authors.forename: T
authors.initials: T
authors.lastname: Lehtonen
mesh_terms: D000328:Adult; D000368:Aged; D003555:Cystinuria / Q000175:diagnosis* / Q000453:epidemiology; D005260:Female; D005387:Finland / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014545:Urinary Calculi / Q000453:epidemiology