Lab results help!

T3 2.92 nmol/l norm: 1.3o-2.8o
T4 127 nmol/l norm: 58-161
TSH 2.25 mIJ/L norm: o.3-5.o
FT4 17.3 pmol/L norm: 1o.o-25.o

Obviously I'm taking this to my doctor 😁 but in the meantime, can anyone tell me what T3 actually is and what it means when it's high?

The initial diagnosis was tachycardia.

So, looking at this, everything seems centered on your thyroid. T3 is one of those thyroid hormones, but honestly, yours is only barely elevated, and since your TSH—that pituitary hormone—is sitting perfectly steady and hasn't dropped, I really don't think your racing heart has anything to do with your thyroid levels.
That being said, you should definitely take all these results to a specialist in nuclear medicine so they can give you a proper, expert read on the situation.

Scott Allen10, I have to correct you on this one.

This specific finding could very well be linked to the tachycardia seen in a young person like Kimberly Davis52.
It is clearly latent hyperthyroidism—essentially just the beginning stages since the TSH levels haven't spiked yet—but that doesn't change the reality of the situation.

Furthermore, an ultrasound of the thyroid is absolutely necessary. It is entirely possible that the entire gland isn't overactive, but rather there is a small adenoma present. In those early stages, it is practically impossible to gauge its activity based solely on hormone levels. An adenoma can trigger hormone releases sporadically at any time of day; therefore, normal morning hormone readings aren't necessarily a reliable metric, especially when tachycardia might manifest, say, in the late evening.😉

Kimberly Davis52, you need to get your thyroid evaluated. You should definitely undergo an ultrasound and test for thyroglobulin antibodies with a nuclear medicine specialist, though in my opinion, seeing an endocrinologist would be even better.

I mean, you’ve got a point there... but honestly, even if that T3 level nudges just past the upper limit, it feels way too small of a jump to trigger tachycardia when everything else is looking totally steady—though I guess we don't really know what kind of heart racing we're talking about here, like if it's just constant or comes in waves.

I definitely agree that getting a more thorough look at the thyroid wouldn't hurt at all; if anything, it’d probably give us some peace of mind.

For almost a year now, my resting heart rate has been sitting at 84. It’s not technically tachycardia, but I used to be down at 64. On top of that, I'm getting worn out way too fast.
Lately, I've been feeling totally sluggish. I’m sleeping through half the day—and no, it's not depression or anything like that—but I constantly need afternoon naps, and my resting pulse is spiking up to 110.
For a while there, it was pretty arrhythmic... kind of looks like this: 😁
But thank God, things have finally leveled out.

granitebadger25 said:Alexx, you really ought to get your thyroid checked out—definitely an ultrasound and testing for thyroglobulin antibodies—by a nuclear medicine specialist, though if you ask me, seeing an endocrinologist is probably your best bet.

granitebadger25, could you send me a PM with a recommendation for a nuclear medicine specialist or an endocrinologist (or both) in the Chicago area? I wouldn't mind a private practice.

Kimberly Davis52 said:For almost a year now, my resting heart rate has been sitting at 84. I mean, it’s not technically tachycardia, but it used to be down around 64. On top of that, I just get tired really easily.
Lately, I've been feeling pretty weak. I end up sleeping through a huge chunk of the day—and honestly, it's not even depression or anything like that—but I find myself needing afternoon naps constantly. My resting pulse even spikes up to 110 sometimes.
It was acting pretty arrhythmic for a while too... kind of looks like this on a monitor 😁
But thankfully, things have settled down a bit.

My mom had symptoms just like these, except her TSH levels were high (they didn't bother testing anything else, though). She has hypothyroidism.

Hey alexx, I went through a phase where my resting heart rate hit 85 bpm too. Back then, I was playing high-level sports, and before things ramped up, I was sitting at around 60. I had that spike in T-waves once as well, just a minor one, along with some palpitations—those skipped beats. I went through every test you can imagine, and honestly, it just settled down on its own. I’d bet it was just a combination of hormones and stress. Same thing happened to my younger sister; she dealt with really intense palpitations, and her pulse would jump north of 100. She was exactly your age when it happened, by the way. Look, obviously go get every checkup possible. It’d be stupid not to, just in case something gets missed. But don't spiral until you actually see a result on paper that gives you a reason to worry. I think a lot of young people deal with these heart quirks eventually. You'll be fine.

Just got my Holter monitor hooked up. 😬
My doctor says I’ll have to redo this hormone panel in two months since the levels aren't high enough to be a real concern yet.
Thanks 🙂