Low TSH out of nowhere - No symptoms, what is going on??

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Had bloodwork today for my yearly physical. Everything came back good except for TSH. It came back low... 0.38 whereas normal is 0.47-4.0. I have no idea where this came from. Last year it was around 2.3 or so. There was a note on the results saying that if you take Biotin supplements it can make the levels appear falsely low, and they recommend stopping them at least 48 hours before bloodwork. This is the first time they've ever mentioned this.

I do take Biotin supplements - about 10,000 mcg a day (and I think there might be some in my multivitamin as well) since I have brittle fingernails. I've taken it for years although last year I believe I was taking a lower dose. I'm hoping this is why it's so drastically low. I did have spinach with dinner the night before and I've heard it contains biotin so could that have made it worse?

Of course they send me these results after hours so I can't contact them about it until tomorrow. I'm freaking out at the very likely possibility I have hyperthyroidism, though I don't have any symptoms. I'm calling my doctor's office tomorrow and hoping to talk to someone about it. I don't see the doctor for my physical until June 15 and I really need to talk to them before then. I'm hoping they can let me retake it and I really hope it's either a lab error or the Biotin threw it off. I can't imagine there being such a steep drop between last year and now and I don't feel any different.

Has anyone else had any situations like this? Any advice? I've calmed down a bit since I first saw the results but I'm still pretty worried/upset about it.

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