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Seasonal Variation in Serum Concentrations of Parathyroid Hormone in Elderly People*
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1983
Year
NutritionVitamin D MetabolitesParathyroid DiseaseParathyroid GlandSeasonal VariationOsteoporosisOrthopaedic SurgeryElderly PeopleParathyroid HormoneOsteoarthritisHealth SciencesBone HealthClinical NutritionEndocrinologyMicronutrientsPhysiology25-Hydroxyvitamin DMenopauseMetabolic Bone DiseaseMedicineGeriatric Endocrinology
In 124 patients with femoral neck fracture and 74 aged control subjects a seasonal variation was observed in the serum concentrations of 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, and PTH. The serum PTH concentrations were maximal in winter, when the vitamin D metabolites were lowest, suggesting a secondary phenomenon.