Thread: Endo and TSH
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Old 10-24-2016, 03:48 PM   #16
Leo41
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I don't know who recommends not taking Rx the day of blood work, but my endo has never mentioned that, and I take my Synthroid and Cytomel as I normally do on those days.

Synthroid doesn't cause any 'spikes' that would affect the hormone level in the blood, and Cytomel works quickly but has a short life. I normally take my Cytomel dose (first of three) about 6 hours before the blood draw, so it would not affect it at all. After the blood is drawn, I take my two additional doses, at the same times that I do every day.

Since the purpose of the labs is to assess your thyroid hormones WITH the supplemental hormones, I don't see why you wouldn't take them.
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