title: Assessment of vitamin K2 levels in osteoporotic patients: a case control study.
abstract: OBJECTIVE
  The aim of this study was to measure the level of Vitamin K2 (Vit K2) in osteoporotic patients and individuals with normal bone density as controls.
  
  
  METHODS
  This case-control study was done in Outpatient Department of Rheumatology at Qazvin Boo-ali Sina Hospital in 2013. Participants were 50 patients with osteoporotic densitometry measured by DEXA (T score? -2.5) who were matched with 48 persons in control group with normal bone density (T score> -1). The level of Vit K2 in samples was measured using enzyme linked immunosorbent assay (ELISA). Data were analyzed by Mann-Whitney U test and Chi-square test.
  
  
  RESULTS
  The level of Vit K2 in patients with osteoporosis was not significantly different from the control group (Median: 75.95 vs. 71.35 nmol/L, respectively; P-value: 0.709). The authors determined cut-offs 75 percentile of vitamin K2 in all participants that was 85 nmol/L and percentages of persons in two groups were similar.
  
  
  CONCLUSIONS
  Although Vit K2 level in patients with osteoporosis was not significantly different from the control group, further studies are necessary to confirm the association of osteoporosis and Vit K2.
authors.forename: Akram
authors.initials: A
authors.lastname: Noori
authors.affiliation: Assistant professor of Rheumatology, Metabolic Diseases Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.. lashkari_49@yahoo.com.
authors.forename: Mahin
authors.initials: M
authors.lastname: Lashkari
authors.forename: Sonia
authors.initials: S
authors.lastname: Oveisi
authors.forename: Mohamad Reza
authors.initials: MR
authors.lastname: Khair Khah
authors.forename: Ali
authors.initials: A
authors.lastname: Zargar
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000367:Age Factors; D000368:Aged; D015992:Body Mass Index; D015519:Bone Density; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000097:blood*; D014812:Vitamin K / Q000097:blood*
chemical_list: D014812:Vitamin K