Thyroid Lab Tests

Paul is an active advocate for thyroid patients through his regular blog posts, which offer a wealth of information that both relate to his books as well as current news and insights.

This category covers thyroid laboratory tests, thyroid lab test results and their interpretation. It covers how they ought to be used and the problems associated with how they are used currently.

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Using TSH to Manage Thyroid Treatment is a House of Cards Ready to Collapse

I recently put out a blog post that introduced an important new piece of research that shows that a suppressed ...

Cortisol Results Inconsistent Between Saliva Testing and Blood Testing

This post may help to explain why sometimes we might see an inconsistency between the result for an 8:00 am ...

Principles and Practical Tips for FT4, FT3 and Reverse T3

This is from a post by Tania S. Smith on her website for Canadian thyroid patients. I have never been ...

Reverse T3 (rT3) – What It Is and What It Means For Thyroid Patients

Reverse T3, also known as rT3, is a possible marker of poor conversion and potentially blunted T3 action. This makes ...

The Unscientific Myth of a Normal T4:T3 Ratio for All Thyroid Thyroid Patients

Here is another great article from Dr. Tania Sona Smith. Just look at the scatterplot within it!  There is no ...

DIO1 and DIO2 Gene Defects and Testing Them for Thyroid Patients with Suspected T4 to T3 Conversion Issues

The D1 and D2 deiodinase enzymes are produced in our cells to enable the conversion of FT4 to FT3 to ...

Only Free T3 (FT3) Tracks Changes in Symptoms During Thyroid Treatment – Research

Only FT3 tracks symptom improvement during treatment. This is a fairly recent and terrific piece of research that clearly places ...

Research Shows TSH Use Should be Scaled Back to a Supporting Role When Treating Thyroid Patients

The way TSH is currently used by endocrinologists and doctors treating thyroid patients is wrong. The way people are treated, ...

Chasing ‘Ideal’ Thyroid Hormone Lab Test Results is The Road to Nowhere for Thyroid Patients

During the 1970s the shift to a lab-test-centric model began. This involved the increasing amount of focus by doctors on ...

The Free T3 (FT3) Laboratory Reference Range May NOT be Applicable for Thyroid Patients Taking: T3-Only, NDT, or T4/T3 Medications

Why is it foolish to rigidly apply the FT3 lab reference range to people on T3-Only, and probably for those ...