Should We Measure Vitamin D Level?

Vitamin D deficiency (serum 25-hydroxyvitamin D > 10 ng per milliliter) increases the risk of bone fracture and muscle weakness. Vitamin D insufficiency is defined as a serum level of 25-hydroxyvitamin D (25[OH]D3) of 10 to 30 ng per milliliter without obvious clinical disease.[1] During the past decade, the effects of vitamin D insufficiency have been studied in cancer, cardiovascular disease, diabetes mellitus, endocrine disorders and immune dysfunction.