Testing vitamin D levels.

Evidence • A systematic review1 on 25-hydroxyvitamin D (25[OH] D) suggests levels greater than 75 nmol/L “are not consistently associated with increased benefit”; greater than 50 nmol/L are “practically sufficient for all persons”; between 30 and 50 nmol/L “places some, but not all, persons at risk for inadequacy”; and less than 30 nmol/L puts one “at risk relative to bone health.” • No RCTs in falls or fractures investigated treating specific VTD level targets. • The proportions of the Canadian, American, and British populations with 25(OH)D levels less than 75 to 80 nmol/L are 97%, 77%, and 87%, respectively2-4; but this is not necessarily a concerning level, according to the systematic review.1 However, of potential concern, 61% of Canadians had levels less than 50 nmol/L,2 and 13% had levels less than 40 nmol/L.1