Throwing thyroid into the mix

June 15, 2010 at 9:10 pm | Posted in Me, rheumatoid arthritis (RA) | 5 Comments
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I went for monthly MTX blood tests today and remembered to ask if the thyroid results were normal – I’d assumed they were, since no one at the surgery had bothered to contact me. They weren’t.

Having said that, they weren’t all that abnormal either, so what are we doing about it? In their case nothing as yet, in my case getting rather confused …and cold …and tired … and achy … but mostly just confused. Until I went in and asked for the results I thought a thyroid test was just that, one test, one answer – OK, not OK, whatever. But no … it turns out there’s a test for thyroid stimulating hormone (TSH) which is produced by the pituitary gland and stimulates thyroxine production from the thyroid gland. Then there’s tests for the two types of hormone the thyroid gland itself produces, thyroxine (T4) and the other one whose name I can’t remember (T3). Counter-intuitively, if you have lots of TSH sloshing about it means your thyroid might be UNDER-active, because you have to produce a lot of TSH to get the thyroid to do anything at all. If you have loads of T3 and/or T4 (produced by the thyroid gland itself) then you obviously have an overactive thyroid as the thyroid is producing loads of the stuff. If you have very little then clearly you have an under-active thyroid.

Symptoms of the latter include feeling cold when it isn’t (box ticked), weight gain or difficulty in losing weight (box ticked), muscle aches (box ticked), abnormal menstrual cycles (oh yeaaaah!), decreased libido (what’s libido again, somebody?), irritability (well … erm … guilty) and memory loss (not sure, can’t remember). However, my levels of T-whatever – not sure if they tested for T3, T4 or both, are in the normal range. My level of TSH though is just outside the normal range – just a smidge too high. As a consequence the docs have decided to wait and see. I can totally understand the logic of this – apparently it does fluctuate and it’s not as if it’s wildly off the scale, so try again in another month and see if it’s still high, and if the levels of T-whatsit have decreased or not.

Really – I can totally understand that – but it’s just sooooo frustrating, as I sit here grumpily shivering, with period pains! (Oh yeah, and a flare just to increase the fun.)

One interesting thing – apparently the most common cause of hypothyroidism (under-active thyroid) is an autoimmune problem. Surprise, surprise!

As to the confusion – I’ve just about got it straight in my head that there are all these tests and roughly what they’re for, but nowhere can I find clear guidance as to what is and isn’t normal range for any of these tests – it seems that for TSH it used to be considered that up to 5.5 was OK, now they reckon about 4.5, or maybe 3.5, or sometimes 2 depending on who you ask, and apparently some authorities in the UK reckon up to 10 is fine! I’m just going to go off and find a nice sandpit to bury my head in for the next month.

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