on the DUTCH blog

Limitation and Caveats on Saliva Testing

By Mark Newman, MS

Our last educational email was about the limitations and caveats of our dutch testing (as well as urine testing in general). In this post, we…

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Limitations of Lab Testing

By Mark Newman, MS

I have three important educational videos to share with you. You will definitely learn some things you didn’t know about each of these tests if…

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Saliva Case Study

By Mark Newman, MS

The following is an interesting case study that highlights the challenge of using saliva testing when monitoring oral progesterone (it is also an interesting example…

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Melatonin Testing Update

By Mark Newman, MS

Melatonin Testing Testing for melatonin is very important however this depends on whether or not your patient is sleeping and if they take melatonin to…

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Common Medications May Cause Adrenal Insufficiency

By Mark Newman, MS

Everyone knows that taking corticosteroids like Prednisone can be suppressive to the adrenal glands – this is why they are usually dosed in a tapering…

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A few thoughts from the desk of Dr. Carrie Jones: Clinical Pearls on SHBG and DHEA

By Mark Newman, MS

Sex Hormone Binding Globulin (SHBG) Clinical Pearls (even though we don’t test it) Commonly when we talk with all of you smart clinicians, you have…

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Is It Profitable to Test Patients Being Treated for Breast Cancer for Estrogen Metabolites?

By Mark Newman, MS

As with so many questions the answer is probably…”it depends!” We believe that 4-OH estrogens are especially problematic with respect to breast cancer risk. Should…

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Measuring Estrone (E1) and Estriol (E3)

By Mark Newman, MS

At a recent conference I was asked my opinion on what to do with a patient who had a certain ratio of estriol / (estrone…

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