What Are Optimal Thyroid Levels?

It’s a term I, and so many other sources for thyroid information, use a lot. What Are Optimal Thyroid Levels?  

A lot of conventional medicine doctors and endocrinologists refuse to acknowledge that it’s not just about falling ‘in range’, but it’s where in range you fall that matters. It matters entirely. Functional doctors support these levels.

Put simply, when your doctor runs a test and you get the results, optimal levels are the results that most thyroid patients state they feel best at. This is a place within a given ‘range’. 

Sources such as Stop The Thyroid Madness, Hypothyroid Mom and Mary Shomon as well as functional medicine, all agree that a TSH less than 2 is considered optimal. Mary Shomon has covered it here. This means that most thyroid patients feel most well when their TSH is less than 2. For you, you may feel best at 0.5, 1.2 or 1.9, but you should try to find out and maintain it at what you feel best at.  10530810_10209343858140580_860583895934403920_n

Free T3 and Free T4 must also always be tested to measure thyroid hormone levels. 

A Free T3 in the top quarter of the range is recommended, with a Free T4 mid-range or a little higher. I do personally feel best at these.

It is important to understand that different labs/doctors use different ranges, so you must interpret your results individually; don’t compare them to anyone else’s. A Free T4 at 14, with a range of 9-19, is mid-range for example, but a Free T4 at 11 is mid-range for a range of 7.5-14.5. So both are considered optimal readings.

It’s important to be aware that a suppressed TSH alone doesn’t mean you’re hyperthyroid/over medicated. If your free t3 and free t4 are still within range then they show you are not hyper/over medicated.

You must look at your result in comparison to the given range, usually stated in brackets, beside it. Where does it fall?  12705332_10209343863300709_8613710526833851340_n

I always tell people to get their thyroid test results printed off, for ease of reference and comparison as you try things to correct your thyroid levels and reach good health. You can post them in my Facebook support group, as we’re happy to help you understand, too.

You can click on the hyperlinks in the above post to learn more and see references to information given, but more reading and references can also be found at:





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2 thoughts on “What Are Optimal Thyroid Levels?

  1. Had private blood test cause not getting anywhere with GP ..been diagnosed 2002 hypothyroidism however I can never stay stable ..either over or under…Currently taking levo…..results tsh 9.11 t4 total 124.0 free t4 20.70 free t3 3.31 b12 18.1 please could you explain what’s going on I’m a bit of a novice….

    1. Hi, as indicated in the post, aiming for a tsh below 2 and using your individual ranges, a midrange or higher ft4 and ft3 in the top quarter, often helps to resolve many symptoms.

      If you’re condition doesn’t stay stable, I’d consider testing to see whether it’s autoimmune. Hashimoto’s is the autoimmune condition that causes 90% of Hypothyroidism cases and can make results move up and down.

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