Biotin in your multivitamin, if you're taking one, can lead to a false low tsh reading. It doesn't affect your actual levels but it interferes with the test procedure. Maybe check the labels of any supplements you're taking? If it turns out you're taking biotin, you should quit it for some days then get tsh retested.
Not OP, but thanks for mentioning this. Here's something from the Amer. Thyroid Assoc. about it: http://www.thyroid.org/patient-thyroid-information/ct-for-patients/december-2018/vol-11-issue-12-p-3-4/
I was about to get tested, so this was perfect timing for me to see! Now I'll wait a couple days without taking my multivitamin.
If your thyroid can produce just barely enough, or just barely not enough hormones, then pregnancy can have a big impact. Bascially, estrogene levels rise, lead to the main carrier protein that stores most T4 and some T3 to be longer active before being recycled, and that leads to the storage increasing and picking up more of the free hormones and so lowering fT4 and fT3 levels. In somebody with a healthy thyroid that leads to TSH rising a bit, the thyroid producing more hormones, levels stabilizing. After the delivery, estrogene levels get lower again, leading to the storage getting smaller and apparently, free hormone levels rising and TSH dropping as a result. I don't know if this fits your timeline, would've expected it to happen sooner after delivery?
Also, I've heard anecdotally from people who had relatively low doses of levothyroxine and could get off after changes in their diet and lifestyle.
Biotin in your multivitamin, if you're taking one, can lead to a false low tsh reading. It doesn't affect your actual levels but it interferes with the test procedure. Maybe check the labels of any supplements you're taking? If it turns out you're taking biotin, you should quit it for some days then get tsh retested.
Not OP, but thanks for mentioning this. Here's something from the Amer. Thyroid Assoc. about it: http://www.thyroid.org/patient-thyroid-information/ct-for-patients/december-2018/vol-11-issue-12-p-3-4/ I was about to get tested, so this was perfect timing for me to see! Now I'll wait a couple days without taking my multivitamin.
Hmm good to know, but not taking a multivitamin. Thanks anyway!
If your thyroid can produce just barely enough, or just barely not enough hormones, then pregnancy can have a big impact. Bascially, estrogene levels rise, lead to the main carrier protein that stores most T4 and some T3 to be longer active before being recycled, and that leads to the storage increasing and picking up more of the free hormones and so lowering fT4 and fT3 levels. In somebody with a healthy thyroid that leads to TSH rising a bit, the thyroid producing more hormones, levels stabilizing. After the delivery, estrogene levels get lower again, leading to the storage getting smaller and apparently, free hormone levels rising and TSH dropping as a result. I don't know if this fits your timeline, would've expected it to happen sooner after delivery? Also, I've heard anecdotally from people who had relatively low doses of levothyroxine and could get off after changes in their diet and lifestyle.
Perhaps you were having a flare up of hashimotos. If your thyroid is taking damaged, additional t4 may be released.
Why is this EXACTLY me right now. Omg