There is no lower threshold level for parathyroid hormone as 25-hydroxyvitamin D concentrations increase.
Vieth
R
R
Department of Nutritional Sciences, University of Toronto, and Mount Sinai Hospital, Toronto, Canada. rvieth@mtsinai.on.ca
El-Hajj Fuleihan
G
G
D004056:Differential Threshold; D006801:Humans; D010281:Parathyroid Hormone / Q000097:blood*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood*
D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D