Increased rates of 25-hydroxy vitamin D testing: Dissecting a modern epidemic.

Manitoba noted a rapid increase in testing, and rise in 25(OH)D concentrations with levels that may be associated with toxicities; both have been reported in other jurisdictions. There appeared to a striking rise in 'unnecessary' tests. We similarly report the benefit of the implementation of a mandatory requisition specifying eligibility criteria for 25(OH)D and education about appropriate testing.