Not taking meds on morning of blood test?

[Hellsy]

I am on Armour and am aware that it's best not to take it on the morning of a thyroid blood test. On STTM it refers to T3 being the potential problem. What about TSH? Would it make a difference to the reading if I take or don't take my morning Armour? Thanks in advance

[greygoose]

It's the FT3 and the FT4 that's the problem with taking your meds before the test. But, TSH doesn't react that quickly, so probably wouldn't change at all. It's the time of day that is important with TSH, and also not eating.

[Hellsy in reply to greygoose]

Thank you.

Why is not eating important I didn't know that.

[greygoose in reply to Hellsy]

TSH drops after eating. Which is one of the reasons it's best to have an early morning test, if you want a low TSH, because you can fast over-night.

[humanbean in reply to greygoose]

it's best to have an early morning test, if you want a low TSH

Typo alert : *if you want a high TSH*

[greygoose in reply to humanbean]

Oops again! I'm really not on form at the moment.

You're right, I meant a high TSH. Thanks for picking that up.

[Hellsy in reply to greygoose]

Ah OK thanks. I have always had breakfast so I'll stick with that for consistency.

[greygoose in reply to Hellsy]

Well, if your doctor isn't phased by a low TSH, it doesn't matter anyway, does it.

[Hellsy in reply to greygoose]

My initial question wasnt connected to my GP. On my last test I did take my am medication and so was undecided whether to keep doing that or revert back to not taking it. So it was for my own benefit

Thanks for your info as it was really helpful.

[waveylines]

Dont know if this helps but Im on a ndt & I dont take any for atleast 24hrs before a blood test.

[Hellsy in reply to waveylines]

Thanks. I usually just don't take.my morning dose and that has been fine so far. My GP doesn't get phased with my TSH being surpressed.

[waveylines]

What a sensible GP!!! 😊😊

[Hellsy in reply to waveylines]

Yes I'm lucky, he's really nice and quite easy going

[Glynisrose]

My endo is always arguing with me about low TSH but I simply say the NDT is doing its job then he generally stops arguing. TSH is NOT a thyroid hormone and you should NOT be judged by it.