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Testing Your Vitamin D Levels
A simple blood test should be performed as necessary to monitor your vitamin D levels. The lowest levels of vitamin D are in early spring, a good time to test yourself. While different labs can vary in their “normal” ranges, blood levels should be between 50-80 ng/mL (or 125-200 nM/L) year-round, with lower levels in this normal range following winter and higher levels within this range in late summer. How much vitamin D you need from all sources to maintain normal levels is very individual. This is best monitored through taking additional blood tests every few months, adjusting your sun exposure and dietary supplements as needed. Tell your health-care professional to include vitamin D in your next blood test, or get an in-home test kit, which is a very accurate, easy, and relatively inexpensive way to test your vitamin D level. These are available through the Vitamin D Council’s Web site (www.VitaminD-Council.org).
Based on recent scientific studies, the currently recommended daily vitamin D levels of 200-400 IU (international units) are grossly inadequate. The average daily need for vitamin D may be as high as 4,000 IU a day in some people.
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