The blood marker 25(OH)D does not measure the biologically active form of vitamin D, and that means it's possible for someone to have a normal 25(OH)D level and still be biologically deficient. Parathyroid hormone, or PTH, can be used to more accurately diagnose vitamin D deficiency.
If your Vitamin D levels are 25-40mg/dl and your PTH >30 more than likely you are not at your optimal Vitamin D levels.
If your Vitamin D levels are 25-40mg/dl and your PTH <30 then you are probably at your ideal vitamin d levels.
Other helpful links:
Our Interview With Dr. Chris Masterjohn https://healthgeeks.co/is-it-really-a-vitamin-d-deficiency/
What is Vitamin D & Why It's Important https://healthgeeks.co/what-is-vitamin-d-and-why-do-we-need-it/
PTH Testing with True Health Labs http://bit.ly/2E4H0Ko
Calcitriol Testing with True Health Labs http://bit.ly/2BoDl77
Test Vitamin D and other lab values and get 10% off at Inside Tracker http://healthgeeks.co/inside
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"ZigZag" Kevin MacLeod (incompetech.com)
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*All information is not intended to replace personal medical advice*