What does this mean?

[Lorna19]

I had blood tests in feb...

TSH 0.05 (0.35-4.7

Today it’s 0.29

Free t4 18 (7.8-21)

Today it’s 9.9

Free t3 6.7 (3.8-6)

Today it’s 5.1

What does this mean? I’ve not had any medication.

Lorna

[greygoose]

It means your TSH is going up slightly, and your Frees are coming down a little. But, without more information, I couldn't tell you why.

Do you have a diagnosis of hypo or something?

Are you taking anything for your thyroid? How much? Has your dose be reduced/increased lately?

Do you have antibodies?

Where your tests both done at the same time of day and fasting?

[Lorna19 in reply to greygoose]

I’ve been diagnosed as overactive by my gp. I’m not on any medication. My antibodies are normal. My tests were done at different times and not with fasting.

[greygoose in reply to Lorna19]

Well, none of those results suggest over-active, except the first TSH. But, a TSH on its own means nothing much. It's over-range FT4/FT3 that tell you you are hyper. And, your FT4/FT3 are now in-range.

It would be a good idea to tell us what times the tests were done, and which antibodies were tested.

[Lorna19 in reply to greygoose]

The first tests were done about 2pm and the second at 9am.

I had thyroid peroxidase antibody tested as normal.

[greygoose in reply to Lorna19]

OK, so that explains why the second TSH is higher than the first.

One negative antibody test doesn't prove you don't have Hashi's. You could still have it. You should also get your Tg antibodies tested.

But, I really do not think you are hyper.

[SlowDragon Administrator]

Which thyroid antibodies testes have you had

TRab or TSI for Graves' disease (over active)

TPO and TG for Hashimoto's - under active (though can be high with Graves too)

Early stage Hashimoto's can have hyper type swings

Important to test vitamin D, folate, ferritin and B12

[Valarian]

Do you have any symptoms, or have you been unwell (eg a virus) ? Presumably the GP had a reason for requesting the original test. You say you aren't on medication, does this mean 'any medication at all' (including dietary supplements), or just 'any medication for thyroid disease' ?

Although GPs, and even endos, are often quick to assume that any cases of hyperthyroidism are down to Graves' disease, there are other potential causes, some of which may resolve themselves spontaneously.

You may find this helpful :

thyroidawareness.com/hypert...

TSH is a pituitary hormone, which effectively tells the thyroid to stop producing more thyroid hormone if there is an excess of it. Whatever caused your thyroid levels to head towards the top of the range, TSH appears to have done its job properly.