I have a blood test tomorrow morning at 8.50 am and had planned to take last night's T4 dose this morning. I forgot and took it as normal at about midnight. Should I take another dose at 8.50 this morning and just leave out tonight's dose? I'm kicking myself!!
Urgent request re timing for blood test - Thyroid UK
Urgent request re timing for blood test
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diamondial
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5 Replies
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I think thyroxine takes about 10 days to take effect so doubtful it would make much odds.
SlowDragonAdministrator
no just go with it …TSH won’t be affected
Ft4 will be slightly low as it will be 36 hours between last dose and test
Or
You could take half tonight’s dose this morning ….and take rest of the dose after blood test
Thanks very much. 😊 I am SO cross with myself though!
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