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

Recognizing Our Staff during Laboratory Professionals Week

Posted by Jillian Harrington, PhD, HCLD on Friday, 27 April

Laboratory Professionals Week logo

Medical Laboratory Professionals Week (MLPW) is a chance to bring awareness and to spotlight the achievements of medical laboratory professionals, whose work is essential to patient testing and fundamental to overall patient health care. There are 18 national organizations that sponsor MLPW, with approximately 300,000 practitioners of clinical laboratory science in the United States (

These organizations are dedicated to making a positive impact in health care through leadership that will assure excellence in the practice of laboratory medicine. Many laboratories plan tours and various other activities during this week to educate non-laboratorians about the field of clinical testing.

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Vitamin D: What Level is Normal vs Optimal? 

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

Woman shading her face from the sun

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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