Tests You Need and Optimal Levels as a Hypothyroid Patient

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As a thyroid patient, the below blood tests are recommended to get the full picture of what’s going on. If you still have symptoms, despite being on thyroid medication, explore these. If you feel well on your thyroid medication, monitor these regularly.

Basically, everyone should monitor their thyroid levels!

You may have to push your doctor or try a few different doctors before you find one who will do them. Alternatively, you could pay for them yourself if this is an option.

Click here for places you can order your own tests from. 

The results you should be aiming for are also shown below on the second half of the page.

Full Thyroid Panel, to include as many of these as possible:

TSH

Thyroid Stimulating hormone. It gives an indication of thyroid hormone levels but doesn’t actually measure them as it is a pituitary hormone and not a thyroid hormone. Read more here.

TSH stands for ‘Thyroid Stimulating Hormone’ and is a hormone secreted by the pituitary gland. It serves as an average read out over the previous four to six weeks of your thyroid levels.

Free T3

A measure of the active thyroid hormone, T3.

There are binding proteins that attach to thyroid hormones to transport through the blood vessels, to cells all over our body. When they reach the cells, only the unbound ‘free’ hormones can actually be used by the cells. Therefore Free T3 levels (and Free T4) are important to monitor. It’s important to be aware that Free T3 and Free T4 are different to Total T3 and Total T4. Make sure you check ‘free’ levels.

Free T4

A measure of the less active thyroid hormone, T4. The body should convert T4 to T3 but doesn’t for a lot of thyroid patients.

Reverse T3

This counteracts the T3 your body is producing, so it is important to test this wherever possible because the three above could potentially be OK, whereas a hidden overproduction of RT3 can cause on-going symptoms because your body is attacking the T3 that is produced.

Thyroid Peroxidase Antibody/ies (TPOAB)

This measures the amount of thyroid attacking antibodies in your blood and is used to identify an autoimmune disease like Hashimoto’s Thyroiditis.

Thyroglobulin Antibodies (TGAB) 

Also used to identify an autoimmune disease like Hashimoto’s.

The Essentials

At the very least, you must have TSH, Free T3 and Free T4 done to get an accurate idea of how you are doing, but also testing Reverse T3 and the two antibody tests are also very important and beneficial.

Other Tests to Explore and results most thyroid information sources state to aim for:

TSH – Below 2 or 2.5 on T4-only medication, but often close to 0 (suppressed) on T3 containing thyroid medication. More information found here.
Free T3 – Upper quarter of the range. More information found here.
Free T4 – Midrange or a bit higher. More information found here.
Reverse T3 – Low in range.
Reverse T3 Ratio – Over 20. Measure the ratio here.
TpoAB and TgAB – In range (over range means you have Hashimoto’s).
B12 – As close to the top of the range as possible.
Vitamin D3 – 50-80 ng/ml, but as close to the top of the range as possible.
Folate/Follic acid – In the top quarter of the range.
Ferritin – 70-90 ng/ml, being slightly higher for men.
Serum Iron – 110 for women, 130-140 for men.
TIBC – About a quarter above the bottom of the range.
Folate – Top half of the range at least.
Magnesium – Mid-range or higher.
RBC Potassium – Top quarter of the range.
Zinc – Top third of the range.

24 Hour Saliva Cortisol Test –
8am – Top of the range.
Midday  – Upper quarter of the range.
4-5pm – Midrange.
11pm – Midnight – At the very bottom of the range.

DHEA – Above mid-range.

***

Always work with a doctor on evaluating and reevaluating your thyroid hormone levels, keeping in mind your symptoms and overall health as well. We’re all individuals and there is no one size fits all, but there are obviously health risks if your thyroid hormone levels, vitamin levels or any others are either too low or too high for an extended period of time. Your doctor should know where they sit best for your health. 

You can click on the hyperlinks in the above post to learn more and see references to information given.

This post may contain affiliate links, to find out more information, please read my disclosure statement.
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Written by Rachel, The Invisible Hypothyroidism

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11 thoughts on “Tests You Need and Optimal Levels as a Hypothyroid Patient

  1. I want to sign up for your newsletter.This is the only place that respond with a place to give up my email. Hope you will add me to your list from here. Others links did not take me anywhere.

  2. My tsh is 0.01 t4 13.1 and t3 4.77 .sub clinical hypothyroidism .I had a total hysterectomy 2 years ago none of hrt patches worked nor did gabapentin .Feel terrible .admitted to hospital with pins and needles down one side of body .I have aching joints .neck pain .profuse swearing. Puffy eyes .anxiety .cold hands and feet ..the list goes on ..at doctors tomorrow is there anything I could ask the doctor , advice please ..so drained with it all .thankyou

  3. My tsh is 0.01 t4 13.1 and t3 4.77 .sub clinical hypothyroidism .I had a total hysterectomy 2 years ago none of hrt patches worked nor did gabapentin .Feel terrible .admitted to hospital with pins and needles down one side of body .I have aching joints .neck pain .profuse sweating. Puffy eyes .anxiety .cold hands and feet ..the list goes on ..at doctors tomorrow is there anything I could ask the doctor , advice please ..so drained with it all .thankyou

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