Thyroid UK
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Whats the temperature test all about??

Iv read a lot about checking your average temperature to test whether your t3 is too high or too low or unstable is this true??

Iv been testing my temperature which generally shows 36.5 which apparently means my t3 is unstable which would make sense at the moment as my tsh is very high and im slowly building up t4... opinions anyone ☺

4 Replies


The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the "normal" body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness.31 Jan 2015

Body temperature norms: MedlinePlus Medical Encyclopedia

Low or high temperature doesn't indicate that T3 is unstable.

Some members think it is helpful to monitor temperature when increasing T4, T3 or NDT as a spike in temperature may indicate over medication. Of course, it may simply indicate a fever too.

High TSH usually indicates low thyroid hormone so it is very likely your T3 is low.

1 like

Thanks clutter very helpful if i need to start having t3...

Can u tell me was u prescribed t3 by an endo? and also reasons why, just trying to figure things out as usual...



I was prescribed T3 only by oncologist for 3 months post thyroidectomy until I had RAI. After that I was prescribed Levothyroxine. Endo prescribed T3 for a month when I had to stop Levothyroxine for repeat RAI. Then I was permanently on Levothyroxine for 15 months an d became sicker and sicker. I self medicated for six months and then endo agreed my health was much improved and prescribed T4+T3 combination.

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Sounds like some journey!! Glad u are feeling better now after all that...

Thats what im so confused about, as i still have my thyroid and have been on levo for 9 years and never felt all the hypo symptoms that everyone has on here and never felt i was getting worse always felt pretty good always on the go plenty energy...

It was only from last october that my tsh had risen and started with herendous anxiety, (never had it before)but at the same time started the teva and was having weird side effects from them too...

Since starting actavis 6 weeks ago the anxiety has got less and less surely its linked...


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