Blood test question

[rosieposie83]

Hi I have a thyroid blood test booked on Tuesday, I usually take my levothyroxine at 3am.

I won't take my dose before my blood test and won't eat but when should I take my dose before. My blood test is 9am should I take my levothyroxine 24 hours before that so 9am Monday or is 3am Monday ok?

[SeasideSusie Remembering]

rosieposie83

Better to take it at 9am on Monday and stick to the 24 hour time gap, by taking it at 3am your FT4 result will show lower than normal.

[rosieposie83 in reply to SeasideSusie]

ok thank you i thought that would be the case but wanted to double check