When to do a finger prick blood test now I'm ta... - Thyroid UK

Thyroid UK

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When to do a finger prick blood test now I'm taking thyroxine at night?

sip1 profile image

I'm unsure when I should be doing my Blue Horizon finger prick test now I've switched to taking my medication at night. Do I skip my nighttime dose and do the test in the morning? Seems quite a long time after my last dose then, and also how do I go about taking my missed dose? Skip it and take the next one at my usual time? (About 10 pm....)

6 Replies

Like you, I take my Levo at night (wee small hours actually!) so when I'm due to do a BH test I simply don't take it that night, and then double up the dose the next night. T4 has quite a long half life in the body and so you won't suddenly run out of it. How much are you taking currently?

sip1 profile image
sip1 in reply to

Thanks for replying :) I'm currently taking 75 mg.

shaws profile image
shawsAdministrator in reply to sip1

You can miss night dose and take after test and the night dose as usual.

in reply to sip1

That's quite a low dose. :) I think you can safely double that up the next night, do your finger-prick test early as per usual. Some people actually take an entire week's worth of Levo at a time, not something I'd want to do!


SlowDragon profile image

I normally take mine at bedtime. I just delay taking it until straight after blood test. Then take the next dose that evening as normal.

helvella profile image
helvellaAdministrator in reply to SlowDragon


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