My partner has a blood test tomorrow (TSH,FT3,FT4) at 11:50am. She took Erfa at 6pm this evening. Is it essential to stop your medication 24 hours before a blood test? I imagine this question has been asked many times but I can't seem to find it.
Stopping medication before a blood test... - Thyroid UK
Stopping medication before a blood test...
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Tony63
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She should be fine, Thyroid hormones peak in the blood a few hours after they have been taken, but she will have left it well over 12 hours.....
G
Personally I do prefer to leave it 24 hours, but think 12 hours is in line with STTM recommendations.
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