The ZRT Laboratory Blog

The ZRT Blog is an extensive resource for patients and health care providers searching for health and hormone testing information. Here, you can read about ZRT’s cutting edge research, advances in testing, wellness advice, and health industry highlights.

Jillian Harrington, PhD, HCLD

Recent Posts

Vitamin D: What Level is Normal vs Optimal? 

Posted by Jillian Harrington, PhD, HCLD on Wednesday, 10 January

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If you have ever had your level of Vitamin D tested, depending on which lab you used, your report showing whether your level is low, normal, or high might have left you scratching your head. In fact, there are multiple agencies all with slightly different opinions on what levels are deficient, insufficient, sufficient, high, or toxic.

When testing with ZRT, you will receive a result that is reflective of your total 25-Hydroxy Vitamin D status (vitamin D2 plus Vitamin D3) in blood. This is the storage form of vitamin D, which is converted by the kidneys to the biologically active form, 1,25-dihydroxycholecalciferol.

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