Why is vitamin D important?
Why should total 25(OH) vitamin D be measured?
How are vitamin D assays standardized?
Why is vitamin D technically challenging?
According to the New England Journal of Medicine, an estimated one billion people worldwide are vitamin D deficient or insufficient. Experts believe at least half of adults over the age of 65 years have reduced bone density. Major causes are the lack of exposure to sunshine and an inadequate supply of vitamin D from foods. Physicians and patients are increasingly aware of vitamin D insufficiency, and labs are responding.
Reference: Medical Laboratory Observer