Test

[RomyJean]

Hi,

Quick question

I took amedicheck blood test 20 minutes after my levo, does this make a difference?

Thanks

[SeasideSusie Remembering]

RomyJean

Advice here is to take last dose of Levo 24 hours before test. Taking it before the test gives a false high FT4 result. However, taking it 20 minutes before the test may not give it enough time to start being absorbed but I cannot say for sure if it will affect result or not. Compare your result to previous result if you took last dose of Levo as we advise, then the result should tell you if it's made a difference.

[RomyJean in reply to SeasideSusie]

Thanks. does it affect tsh levels too. Sorry new.

[SeasideSusie Remembering in reply to RomyJean]

No, TSH level is affected by time of test. TSH is highest early morning and lowers throughout the day.

[shaws Administrator]

Yes, it will make a difference to your results. It is recommended that when having a blood draw it should be at the very earliest a.m.

It is a fasting test (you can drink water) and to get the earliest blood draw but we don't take thyroid hormone replacements until after the blood draw.

[SlowDragon Administrator]

Bloods should be retested 6-8 weeks after any dose change or brand change in levothyroxine

TSH is slow to alter after any dose change

How much levothyroxine are you currently taking and how long on this dose

Which brand of levothyroxine

Are you also testing vitamin levels?