Thyroid UK

Now my sons TSH has come back high but ft4 and ft3 look ok??........what does it mean?

I persuaded my son to have his thyroid bloods done because about a year ago his TSH was in range BUT only just. So we've repeated his bloods and these are the results

TSH 4.24 high. (0.27-4.2)

FT4. 16.3. (12-22)

FT3. 5.1. (3.1-6.8)

His TSH is only just above range. He's 25 but has quite exaggerated mood swings.

His FT's look pretty good. So what does it all mean?

Many thankx

6 Replies

Joesmum, your son's FT4 and FT3 are good because his high TSH is flogging the thyroid to produce hormone. He's subclinically hypothyroid according to that range but if your NHS range is different, typically top of range may be 4.5 or 5.5, your son may still be within range and might not get a diagnosis yet.


Thanks for your replies.

I think I'm going to have to keep an eye on this. He's sort of in denial at the moment. He's seen how badly its affected me so a bit of the ostrich syndrome is happening.

Think I'll get the antibodies etc done and keep you posted.

I think it would certainly explain his foul mood swings!x


Joesmum, you could point out that early diagnosis and treatment means things are much simpler to fix.

If you've any NHS thyroid lab results check the ranges. If your son is close to the top of the TSH range get him tested via his GP in 3-6 months. Bear in mind NHS doesn't always diagnose on the first abnormal result and may want to repeat 3 months later.


Will do. Great advice. Thank you.


He is going hypothyroid because the TSH is kicking his thyroid

whats needed is tests for

thyroid antibodies




vit d3


Hi mum, you've probably seen some of the videos I've posted by Dr. Clark. Your comment about mood swings caught my attention. The video on dopamine neurotransmitters may be involved with low T3, in fact, a little research shows that T3 may be useful for some conditions like bipolar. There may also be a connection with vertebrae in the neck area being out of sync.

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