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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Thyroid Blood Testing with Blue Horizon Medicals

Private thyroid hormone, cortisol and other useful blood tests for UK thyroid patients. In partnership with Blue Horizon Medicals, this ...

Biochemical Bigotry – Enforcing Normalised Thyroid Lab Test Results is Harmful to Health

Here is another great article about the flawed use today of thyroid laboratory tests and lab reference ranges. It talks ...

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 – What It Is and What It Means For Thyroid Patients

Reverse T3 (rT3) is a marker of poor conversion and potentially blunted T3 action. This makes it useful to test ...

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

Here is another great article from Professor 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 ...

Thyroid Laboratory Test Results and Ranges: Can They Really be Used for All Thyroid Medications? 

I have written about this topic in my books, especially The Thyroid Patient's Manual, and in various blog posts. I may refer ...

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 ...