Should I take my Levo at night when having bloo... - Thyroid UK

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Should I take my Levo at night when having blood tests the next day?

VanessaB profile image
8 Replies

I take my meds at night I have previously taken my tablets before my blood test in the morning is that right? Or do I miss that days?

So much to take into consideration

Thank you x

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VanessaB profile image
VanessaB
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8 Replies
Jackie profile image
Jackie

Hi Personally I find I need to take my thyroid treatment up to 12 hours before a test,but never less. Can you take yours slightly earlier? I would not like to miss a dose, although, when in ITU and other similar times, I have had to as in a coma and it has not effected my thyroid noticeably at all.

Jackie

shaws profile image
shawsAdministrator

I would miss the night's dose as the tablet you take tonight has a half life of 8 days.

VanessaB profile image
VanessaB in reply toshaws

Thank you for the reply Shaws but I'm not sure by what you mean when you say tonight's dose has a half life of 8 days.

And thank you for all your replies your knowledge and help over the months has been a god send.

Best wishes Vanessa x

shaws profile image
shawsAdministrator in reply toVanessaB

It means if I take 100mcg levo today and take no more thereafter for the next six/seven days it will still be producing 50mcg daily. If I am wrong someone will correct me.

Glynisrose profile image
Glynisrose

NEVER take your meds before a test, blood tests only measure whats in the blood and if you have taken meds up to 12 hours before then thats what will show up!! Take your meds directly AFTER bloods have been drawn so that you don't miss a dose.

marram profile image
marram

I have never missed a dose of Levo for a blood test, not sure if it would make a difference to the test because Levo has a far longer half-life that T3. If I miss a dose or take it very late I am usually very sluggish and tired a couple of days later, and I hate that.

I am fairly sure that you would have to drop your dose several days before if you are on Levo for it to have any effect on the blood test, but I'm no expert by any means.

On T3 I know many have advised to delay a dose until after the test.

galathea profile image
galathea in reply tomarram

Well if I were you, I would try it and you might find that the doctor puts you back on the dose of levo which made you feel well! Fingers crossed!

G x

helvella profile image
helvellaAdministrator

I defer my usual bed-time dose until after the test - then take it straight after. And take today's dose as usual at night.

This is one of the reasons I always try to get the blood drawn as early as possible. I can catch up my levothyroxine! Also, TSH is higher very early in the day.

Others might find doing this does not work for them.

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