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.

Search by keyword:

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 the dosing of ...

We Need a New Paradigm of Thyroid Treatment!

It is desperately clear to thyroid patient support groups and to many well-informed thyroid patients that there is an urgent ...

More T4 or T3 Thyroid Medication May Not Always Raise Patients’ FT3 Levels in Thyroid Hormone Treatment

Sometimes 2 +2 does not equal 4 when dealing with thyroid hormones. This blog post is relevant to those patients ...

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 ...

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 ...

The Thyroid System- What You Need to Know (& what your doctor may not know) – YouTube Video Blog 

My name is Paul Robinson. I am the author of three books on recovering from hypothyroidism: The Thyroid Patient's Manual, ...

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 ...

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 ...