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.

Looking Back: Popular Provider Blog Posts of 2016

Posted by ZRT Laboratory on Monday, 09 January

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As we step into 2017 ready to further our understanding of how hormone imbalance affects health, we wanted to take a brief moment to reflect on the top stories of 2016 that captured your attention on the ZRT Blog.

Following is a round-up of 2016's most popular posts for practitioners.


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How to Use the Cortisol Awakening Response (CAR) in Addressing Adrenal Function

Posted by Dr. Allison Smith on Friday, 04 March

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Treatment Takeaway

On awakening cortisol should increase about 50% in the first 30 minutes then begin to progressively drop the remainder of the day. Three, rather than one, early morning collections are what is needed to accurately assess the CAR; one immediately on waking, one 30 minutes later, and another at 1 hour.

Diurnal Cortisol Curve Assessment

Thirty minutes after awakening from a good night's sleep, cortisol levels are at the highest they'll be all day. Following the morning peak, cortisol levels then fall to less than half that peak level by noon. They continue to drop to very low levels at night where they stay low during the sleep hours. Some individuals have a sharp rise to reach morning levels, others a more gradual incline. Looking at cortisol levels graphed during the day, any abnormal elevation, or depression of levels, or a loss of the expected curve with its characteristic morning peak and swooping decline towards evening may suggest HPA axis dysfunction – which is what we're most interested in assessing when we're looking at a diurnal cortisol curve (i.e. a 4-point cortisol test).

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