25(OH)D	25-hydroxyvitamin D
UVB	Ultraviolet B
UV index	Ultraviolet index
MED	Minimal erythemal dose
VDR	Vitamin D receptor
LC–MS/MS	Liquid chromatography–tandem mass spectrometry
CLIA	Chemiluminescence immunoassay
VDSP	Vitamin D Standardization Program
IOF	International Osteoporosis Foundation
iPTH/PTH	Intact parathyroid hormone/parathyroid hormone
ALP	Alkaline phosphatase
RDA	Recommended dietary allowance
DRI	Dietary reference intake
BMI	Body mass index
IOM	Institute of Medicine
IFG	Impaired fasting glucose
IGT	Impaired glucose tolerance
NGT	Normal glucose tolerance
T2DM	Type 2 diabetes mellitus
DPP	Diabetes Prevention Program
DPS	Finnish Diabetes Prevention Study
TEMD	Turkish Society of Endocrinology and Metabolism