Free T4 &/or Free T3

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 tag will be used when either or both of the Free T4 (FT4) and Free T3 (FT3) levels of thyroid hormones are being discussed. It also applies when a blog post is discussing the thyroid lab tests for FT4 or FT3.

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Paul Robinson’s Observations on Thyroid Treatment Issues

I thought I would share my observations on the different categories of treatment issues that I have seen over the ...

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 am ...

Using the Percentile of the Reference Range for Thyroid Hormone Blood Test Results Can Often Be Revealing

This is a very simple blog post about thyroid blood test results that I was prompted to write as a ...

Current Diagnosis and Treatment of Hypothyroidism are Both Fundamentally Flawed

I have recently been given a new paper written by Professor Rudolf Hoermann, Mel Rowe and Peter Warmingham. The three ...

Low T3 Levels Are Linked to Low Insulin and Increased Risk of Developing Type 2 Diabetes

A 2016 research study by the Endocrine Society showed that the thyroid hormone T3 controls and regulates the release of ...

Can Someone Have Free T4 and Reverse T3 When Taking T3-Only Medication?

From time to time, a thyroid patient asks me the question: how can they have a reasonably high level of ...

Why So Many Thyroid Patients Fail to Recover on Levothyroxine (T4)

This is a great new blog post from Dr Tania S. Smith of Thyroid Patients Canada. The post clearly spells ...

Is There a Connection Between Thyroid Hormones and Depression?

Far too many anti-depressants are prescribed these days when the real issue is some underlying cause. I know of many ...

Using SPINA-Thyr Software for Patients on No Thyroid Treatment or on Levothyroxine (T4) Only

SPINA-Thyr is a free diagnostic application, developed by Dr. Johannes Dietrich. The software application takes thyroid laboratory test values TSH, ...

Can FT3 be Used to Manage Liothyronine (T3) Thyroid Treatment?

Many doctors and thyroid patients think that the FT3 thyroid lab test can be used to assess whether the dosing ...