Thyroid UK
82,839 members97,872 posts

Can you tell how long you have been thyroid has been under active from you TSH level?

Hi all

New to this site and was wondering if TSH level was a guide to how long there had been a problem with my thyroid.

I was diagnosed about 4 months ago with a T3 level of 2.4 and a TSH level of 43.

I am currently taking 125mg of levothyroxin and due another blood test in September.

TSH was 7 at my last test at the end of July.


7 Replies

I'm not entirely sure you can. And, it wouldn't be much of a guide if you have antibodies, and have been swinging between hypo and hyper.

I think I've been hypo since I was at least 8 years old. I was finally diagnosed when I was 55. My TSH was about 11.5.

In 2013/14, I stopped taking all thyroid hormone replacement (for reasons I won't go into here) for six months. When I was retested, my TSH was forty-something. Up from zero. So, I don't think that tells you much at all.

1 like

I didn't think you could tell from TSH levels but I thought I'd ask. I can't remember when I started having symptoms but I do remember having problems at work about 8 years ago and weight gain ever since. So maybe it was back then.


I don't think we can ever know when it starts, just when it gets bad enough to notice.

1 like

That's a really good reduction in TSH in 4 months, you have responded well to treatment. When my TSH was 19 I was told my thyroid had been struggling for 7 years. Don't know mathematical ratio calculation. Good luck with your continuing treatment.


You may be able to recall an infection that was the starting point.I believe mine was a tooth/ gum infection, after which I had difficulty staying awake.


TSH is NOT a thyroid hormone it is a pituatary hormone.


You could do as i did ask your gp if youve been tested for thyroid problems In the past. I got readings from 2003 and it appears I had thyroid issues then but was just never told.


You may also like...