Episode 72: WE’RE BACK with Vitamin D, vim, and vigor
In episode 72, we find out what Mike has really been doing for the last 3 months by testing his Vitamin D level and finding it to be abnormally high. This leads us, along with our always charming guest Dr. Tina Korownyk, to a discussion of the proper use of Vitamin D levels and what they really mean. At the end of the podcast James and Mike both agree to do podcasts more often than every three months.
1) Different reference Vitamin D levels
2) “the most-ordered hormone assay in the United States”
J Clin Endocrinol Metab 2009;94:1092–3
3) Vitamin D levels
Am J Clin Nutr 2008;88:558S-564s
4) Multiple health outcomes and Vitamin D levels – nonvertebral fractures, hip fractures, periodontal disease, balance, colon cancer, falls
Arch Intern Med 2009;169:551-61
“whether an individual is found to have low or normal vitamin D status is a function of the laboratory used”
J Clin Endocrin Metab 2004;89:3152-7
5) Variability Differences between the mean values of labs was 38%
Mean relative uncertainties between labs were 19.4%, 16.0%, and 11.3%
Ost Int 2009 – 9 September 2009 –Online
Within patient variability – 15-20%
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