I've never been told to fast before thyroid tests. Is it usual to have to fast? Wonder if this could be why both my son & I don't seem to benefit fully from thyroxine
Doctors don't tell you to fast, but the knowledgable members on here really do advise it. It can make a big difference to your thyroid results.
If you fast you will get a more accurate result. It is always advisable NOT to eat breakfast and DO NOT take medication before the test, take after you have had it done.
Leave 24 hours from last does of levo. before test and if on NDT like I am, I take my afternoon dose the day before but do not take my next dose until after bloods have been taken. This means I do not take NDT around 17 hours before my blood test, although I think 12 hours is O.K.
Thanks for that. I had read about fasting before a test and asked the doctor, who said there was no need. I think I will, just to be on the safe side as my first full function thyroid blood test is this week!
I've never fasted just for thyroid tests but I had a whole range of blood tests yesterday at my local Hospital (full thyroid, cortisol, gluten intolerance, not sure what else!!) at 9am and the nurse double checked that I hadn't had anything since midnight. So 8-9 hours I think should be fine. Good luck with your tests.
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