title: Vitamin D deficiency in general medical inpatients in summer and winter.
abstract: BACKGROUND
  Vitamin D deficiency is common in various populations worldwide. Adverse effects of vitamin D deficiency are the development of bone disorders; however, other diseases such as multiple sclerosis, type 1 diabetes, rheumatoid arthritis and certain cancers have also been linked to vitamin D deficiency. The general medical inpatient population is a group at increased risk of vitamin D deficiency. These patients often have coexistent risk factors for its consequences. This study aims to document a point prevalence of vitamin D deficiency in this population.
  
  
  METHODS
  Two cross-sectional audits of patients admitted to general medicine units were carried out--the first in mid-November at the end of winter and the second in mid-April and May at the end of summer. Information regarding patients' comorbidities, medication usage, previous falls and fractures was obtained and serum 25-hydroxyvitamin D, parathyroid hormone and calcium levels were measured.
  
  
  RESULTS
  A total of 129 patients was studied (65 in winter and 64 in summer). Ninety-four patients (74%) had 25-hydroxyvitamin D levels < or = 50 nmol/L. Seven patients had severe deficiency (levels < or = 12.5 nmol/L). Average vitamin D levels were lower at the end of winter (35 vs 43 nmol/L, P = 0.007). Of the 37 patients receiving vitamin D supplements, 20 (54%) had 25-hydroxyvitamin D levels < or = 50 nmol/L.
  
  
  CONCLUSIONS
  Low vitamin D levels were common in this general medical inpatient population. The average vitamin D level was lower in the patient group tested in November following winter. Supplementation of vitamin D did not uniformly prevent deficiency.
authors.affiliation: Department of General Medicine, Royal Melbourne Hospital, Melbourne, Victoria, Australia. simechaty@hotmail.com
authors.forename: S M
authors.initials: SM
authors.lastname: Chatfield
authors.forename: C
authors.initials: C
authors.lastname: Brand
authors.forename: P R
authors.initials: PR
authors.lastname: Ebeling
authors.forename: D M
authors.initials: DM
authors.lastname: Russell
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005194:Family Practice; D005260:Female; D006801:Humans; D007297:Inpatients; D008297:Male; D008875:Middle Aged; D012621:Seasons; D013472:Sunlight; D014808:Vitamin D Deficiency / Q000175:diagnosis / Q000453:epidemiology*