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.

Cortisol Testing in Saliva, Blood & Urine

Posted by Dr. David Zava on Friday, 29 May

Patient collecting for saliva, blood spot, and dried urine testingPractice Takeaway: Providers should be aware that three different body fluids – saliva, blood or urine – can be used to assess adrenal gland function, and should know each method’s advantages and disadvantages, when deciding how to test patients.

Inadequate or excessive production or disrupted circadian patterns of cortisol synthesis by the adrenal glands in response to stressors can eventually lead to imbalances in blood glucose levels, impaired immune response, as well as a host of different hormonal imbalances, all of which are associated with multiple adverse conditions and symptoms.   

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How to Use a Symptom Checklist to Choose a Hormone Test

Posted by Dr. Sherry LaBeck on Tuesday, 12 May

Patient filling out symptom checklistSymptoms of hormonal imbalance can often be challenging to assess.

Is your patient exhibiting signs of estrogen dominance because her estrogen is too high or is it due to the progesterone being too low?

Is his fatigue because he’s not making enough testosterone or that his adrenal glands are working over-time?

Are her imbalanced sex steroids the cause of her depression or is it the low thyroid hormone?

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New Research on Vitamin D Using Dried Blood Spot Testing

Posted by Margaret Groves on Thursday, 23 April

Woman embracing the sunshineTwo vitamin D studies were published recently, both utilizing ZRT's testing in dried blood spot.

Dried blood spot samples are well suited for research applications because they are equivalent to serum but have the advantage of ease of sample collection, shipping, and storage, which doesn’t require any refrigeration or biohazard labeling. Also, samples are easily identified by details that can simply be written on the outside flap of the collection cards, which require minimal freezer space for long-term storage of samples.

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Testosterone: Elixir or Dangerous Drug?

Posted by Dr. David Zava on Wednesday, 19 September

Mature men playing football on the beachAn FDA-approved testosterone gel was shown to significantly increase risk for adverse cardiovascular, respiratory, and dermatological events in men 65 or older who had impaired mobility and increased health risks.

This is according to a recent study published in the prestigious New England Journal of Medicine (NEJM) (1) that casts a shadow on the common use of testosterone therapy in older men for boosting their energy and vitality. 

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