He is the Co-founder and Chairman of O'Leary Funds and the co-founder of Softkey. He has also previously served as a business journalist on CBC 's The Lang and O'Leary Exchange with Amanda Lang and hosted Redemption Inc.ailed as Canada's business equivalent of Donald Trump, O'Leary is one of Canada's most prominent entrepreneurs, investors, and financial pundits.
When calcium is low and/or a person has symptoms of vitamin D deficiency, such as bone malformation in children (rickets) and bone weakness, softness, or fracture in adults (osteomalacia), 25-hydroxyvitamin D usually is ordered to identify a possible deficiency in vitamin D.
A simple blood test called the 25-hydroxy vitamin D test can measure levels of vitamin D in the blood. Levels of the vitamin are measured in nanograms per milliliter (ng/mL). 20 ng/mL to 50 ng/mL is an adequate level for bone and overall health, and a level less than 12 ng/mL indicates vitamin D deficiency.