title: [Determination of the calcium/creatinine index in urine in healthy neonates, infants and children].
abstract: The authors examined a total of 107 healthy subjects--neonates (n = 13), infants (n = 23), toddlers (n = 16), 3-6-year-old children (n = 15) and school children (n = 40). They correlated the urinary Ca excretion mmol/kg/24 h) with the Ca/cr index which was obtained by examination of postprandial urine sample. They revealed a significant correlation of the excretion and index in infants p less than 0.001, in school children p less than 0.01 with a regression coefficient of 0.9 and 0.7 resp. The index was significantly age dependent, the value of the 95th percentile in neonates was 1.38, in infants 1.025, in toddlers 1.26, in three-year-old children 0.835 and in school children 0.56. The urinary Ca/cr values must be thus interpreted in relation to the child's age; the index declines with age. The reason for high indices in young children is the low creatinine concentration in the excreted urine which rises significantly with age. Examination of the Ca/cr index should be part of routine screening in all cases with suspected nephropathy. The accepted upper range of the index, 0.6 (mmol/mmol), applies only to school children, but not to younger children.
authors.affiliation: I. dĕtská klinika Fakultní nemocnice, Motole, Praha.
authors.forename: J
authors.initials: J
authors.lastname: Janda
authors.forename: J
authors.initials: J
authors.lastname: Feber
authors.forename: M
authors.initials: M
authors.lastname: Sikut
authors.forename: S
authors.initials: S
authors.lastname: Carková
authors.forename: R
authors.initials: R
authors.lastname: Smísková
mesh_terms: D002118:Calcium / Q000652:urine*; D002648:Child; D002675:Child, Preschool; D003404:Creatinine / Q000652:urine*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012016:Reference Values
chemical_list: D003404:Creatinine; D002118:Calcium
vernacular_title: Stanoveni indexu kalcium/kreatinin v moci u zdravých novorozenců, kojenců a dĕtí.