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  • Should you take thyroxine before blood test
  • Should i take thyroid medication before tsh test

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  • Can i take thyroid medicine before fasting blood sugar test...

    Originally published on 30th May 2017Last updated on 1st December 2023

    Common questions about thyroid blood tests for those with medical conditions such as a thyroid disorder include:

    • Do I take my thyroid medication as normal before the blood draw?
    • Do you need to fast for thyroid blood work?
    • How often should it be done?
    • Does it need to be in the morning?
    • Can it be done in the afternoon?
    • Is fasting required for a TSH test?
    • Can I have a thyroid blood test on my period?
    • What should be tested?

    If you feel overwhelmed by all these questions, it’s worth checking out my book which covers them all in a concise, easy-to-digest way.


    Probably the most important thing to be aware of as someone with a thyroid condition, is whether you should take your thyroid medication before or after having any testing done.

    When To Take Medication

    T4-Only Meds

    In regards to T4-only medication such as Levothyroxine and Synthroid, they only have a half-life of around five to nine days, which means that once you’ve become stable on a dose, it takes around a week for half

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