title: Stable isotopic measurement of endogenous fecal calcium excretion in children.
abstract: Using a stable isotopic technique in which 42Ca was administered via a bolus injection, we measured endogenous fecal calcium excretion, Vf, in five healthy children, aged 3-14 years. The Vf averaged 1.4 +/- 0.4 mg/kg/day, and was lower than urinary Ca excretion (Vu) in four of the five children. These results for Vf are consistent with previously reported results for Vf in healthy adults and much lower than those reported in premature infants. These results may be useful in understanding developmental changes in Ca metabolism and in interpreting dual tracer Ca isotope studies in children.
authors.affiliation: Laboratory of Theoretical and Physical Biology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: S A
authors.initials: SA
authors.lastname: Abrams
authors.forename: J B
authors.initials: JB
authors.lastname: Sidbury
authors.forename: J
authors.initials: J
authors.lastname: Muenzer
authors.forename: N V
authors.initials: NV
authors.lastname: Esteban
authors.forename: N E
authors.initials: NE
authors.lastname: Vieira
authors.forename: A L
authors.initials: AL
authors.lastname: Yergey
mesh_terms: D000293:Adolescent; D002118:Calcium / Q000378:metabolism*; D002127:Calcium Isotopes; D002648:Child; D002675:Child, Preschool; D005243:Feces / Q000737:chemistry*; D005260:Female; D006801:Humans; D008297:Male; D012016:Reference Values
chemical_list: D002127:Calcium Isotopes; D002118:Calcium