title: Seasonal variations in urinary excretion of calcium and oxalate in normal subjects in patients with idiopathic hyperclaciuria.
abstract: A longitudinal 9-year retrospective study of 24-hour urinary calcium values has been made in a metabolic stone clinic amongst patients with idiopathic hypercalciuria. No seasonal variations could be observed in contrast ot a previous study from Leeds, A prospective longitudinal study was made of 24-hour urinary calcium values in a small group of normal subjects. No seasonal variation could be ovserved. In the prospective study no seasonal variations in urinary oxalate could be observed. In a 2-year longitudinal study of stone patients with idiopathic hypercalciuria, urinary oxalate was found to be higher in the summer than in the winter. This was attributed to the combination of a higher intake of oxalate-rich foods in the summer, and the low calcium diet with which they were treated.
mesh_terms: D002118:Calcium / Q000652:urine*; D002128:Calcium Metabolism Disorders / Q000652:urine*; D002986:Clinical Trials as Topic; D006801:Humans; D008137:Longitudinal Studies; D010070:Oxalates / Q000652:urine*; D011446:Prospective Studies; D012189:Retrospective Studies; D012621:Seasons
chemical_list: D010070:Oxalates; D002118:Calcium