title: Absence of a relationship between thyroid hormones and vitamin D levels.
abstract: BACKGROUND
  Vitamin D is an immune modulator that may play a role in thyroid related autoimmunity.
  
  
  METHODS
  We analyzed a US population based dataset to determine the relationship between serum 25-hydroxyvitamin D (25OHD) and thyroid hormones while assessing the effects of autoimmunity and BMI.
  
  
  RESULTS
  25OHD did not correlate significantly with any thyroid related measure. 25OHD levels stratified by thyroid antibody status were not statistically different between antibody positive and negative groups. The mean 25OHD levels of lean, overweight, and obese groups defined by BMI were lower than those of the normal group. Only the mean thyroid stimulating hormone (TSH) value in the obese group was significantly higher than the normal group.
  
  
  CONCLUSIONS
  We conclude that thyroid related measures and 25OHD serum levels are not related.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhou
authors.forename: Jinny
authors.initials: J
authors.lastname: Cai
authors.forename: Morri
authors.initials: M
authors.lastname: Markowitz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013963:Thyroid Hormones / Q000097:blood*; D013972:Thyrotropin / Q000097:blood; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D013963:Thyroid Hormones; D014807:Vitamin D; D013972:Thyrotropin; C104450:25-hydroxyvitamin D