title: Assessment of Circannual Rhythm in Plasma Level of Vitamin D Among Kidney Transplant Recipients in Mashhad.
abstract: We studied plasma vitamin D level in 96 kidney transplant recipients and its circannual rhythm. Blood samples were tested for 25-hydroxy vitamin D, parathyroid hormone, creatinine, phosphate, and calcium levels in winter and summer 2014. The mean age was 41 years, and the mean transplant age was 6.1 years. Plasma levels of 25-hydroxy vitamin D were 18.0 ± 15.0 ng/mL in winter and 18.3 ± 14.7 ng/mL in summer (P = .64). Parathyroid hormone was inversely correlated with vitamin D level in both seasons (r = -0.044, P < .001). There was no relationship between vitamin D and other variables. Our study showed vitamin D deficiency is prevalent among kidney transplant recipients both in winter and summer. Also, vitamin D level did not rise from winter to summer. It is recommended to routinely check on kidney transplant recipients' vitamin D status.
authors: Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. saman.nazemian@gmail.com.
authors: Seyed Saman
authors: SS
authors: Nazemian
authors: Mahin
authors: M
authors: Ghorban Sabbaq
authors: Fatemeh
authors: F
authors: Nazemian
authors: Maryam
authors: M
authors: Salehi
authors: Faezeh
authors: F
authors: Madani Sani
mesh_terms: D000328:Adult; D003404:Creatinine; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007492:Iran; D016030:Kidney Transplantation; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood; D012621:Seasons; D066027:Transplant Recipients; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D014808:Vitamin D Deficiency / Q000453:epidemiology*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D; D003404:Creatinine