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.
There is another blood test for normal vitamin D levels, called Vitamin D 1,25 Dihydroxy level or 1,25(OH)(2)D. The Vitamin D, 1,25 Dihydroxy level does not have a major change until normal Vitamin D levels, or 25(OH)D, drops to levels that are considered a VERY severe Vitamin D deficiency. 1,25 dihydroxy-vitamin D or 1.25 Dihydroxy level or 1,25(OH)(2)D has the normal values are usually listed as 20-76 pg/ml.