Thyroid test demystifying what should be in the labs, and what do they mean.

Updated: Nov 13, 2019

Dr Westin Child’s information is Still the guru to date on the thyroid and how to help the condition. If you have thyroid issues maintainig a normal lifestyle is almost impossible.

When you look at your lab tests you want to avoid looking at the standard reference range that comes with your labs. This is NOT the range that you want to compare yourself to. 

We know that as people age thyroid status in the body tends to decline. Therefore, using this logic, we can make the general assumption that higher levels of free thyroid hormones are associated with youth and longevity. And this holds true for MOST people even those who are taking thyroid medication. 

Because of this, you generally want your lab tests to be in the high "range" of that broader normal range provided. 

Below, you will find a list of "optimal" and "normal" ranges for all thyroid lab tests:

Complete Lab Test

Abbreviation (Commonly referred to as)

Normal Range (Reference range on labs)

Optimal Range (Based on healthy adults)

Thyroid stimulating hormone

TSH 0.450 - 4.500 uIU/mL 0.5 - 1.0 uIU/mL

Free T3, Triiodothyronine

FT3 2.0 - 4.4 pg/mL 3.8 - 4.4pg/mL

Free T4, Thyroxine

FT4 0.82 - 1.77 ng/dL 1.4 - 1.77 ng/dL

Reverse T3, Reverse Triiodothyronine

RT3 9.2 - 24.1ng/dL

Less than 15.0 ng/dL

Total T3, Total Triiodothyronine

T3 71 - 180 ng/dL 150 - 180 ng/dL

Thyroglobulin Antibody

TgAB 0.0 - 0.9 IU/mL 0.0 IU/mL

Thyroid Peroxidase Antibody

TPOab 0 - 34 IU/mL 0.0 IU/mL

If your lab tests are not in this range then you will want to make adjustments to whatever therapies you are using to try and get them there. 

This may mean changing your medication, increasing your dose, decreasing your dose, changing your diet, using other natural therapies, adding supplements to your regimen, exercising, and so on. All of these factors CAN and DO influence your thyroid lab tests. 

As you improve your thyroid lab tests you will notice that you feel better and better each and every day. 

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