TRH Test

[strawberrysorbet]

I'm having a TRH test on Friday to see if I've got central hypothyroidism. The Endo doesn't seem convinced though.

Are there any tips I should follow before the test? E.g fasting etc?

Also if I have primary hypo with just a lower TSH do you know if this would show up on the TRH test or would it just come back as normal?

[Hidden]

Your very lucky. I'm central and have never been offered a TRH test. 😞 which does make me sound a bit strange!!!

I would just be curious to have one.....might ask for one.....

The TRH test should determine primary from central.

Either way you should get a definitive result of either tertiary, secondary or primary hypothyroidism.

Seriously you are very lucky to get a TRH test because they don't offer them to many.

I just looked at your previous posts and you do look as if you've got central hypo, similar to me. Why doesn't your endo seem convinced?

Xx

[strawberrysorbet in reply to Hidden]

Hi Joesmum,

He's not convinced as I'm only just under the reference range and he's checked some of my other pituitary hormones and they are normal. He thinks having a FT4 of 11 may just be normal for me. This is why he's doing the test as he won't medicate me if it comes

back normal.

I see your FT4 is a lot lower than mine, so presumably that's why they didn't need to do one on you?

I'm not looking forward to it as I hate needles and there are drips/injections and multiple blood draws. Eek. But at least hopefully I will get an answer.

Did you find out which type of central you had and why your TSH wasn't higher? Did you have an MRI?

[Hidden in reply to strawberrysorbet]

Apparently I'm tertiary ( hypothalamus). I did have a pituitary scan which showed a wonky shaped pituitary gland with a domed surface. There was no adenoma though. My pituitary hormones are normal so I believe but what does 'normal' mean!

In order to get my FT4 and FT3 high enough my TSH is incredibly low.