Should I take Levo before blood tests?

Evening everyone.

I've reverted back to taking my 50mg Levo in the morning.

I've got blood tests tomorrow at 9am......should I take my Levo as normal when I wake up as normal around 7.30 or after my bloods??

Also I was at a family wedding yesterday and was a tad 'worse for wear' this morning and for the life of me can not remember if I took my Levo this this ok or should I re-book??

Thank you.

22 Replies

I don't take my meds on the morning of a test - it doesn't show the true situation.

Thanks Ruthi, I thought as much.

And I suppose I should add that in general you don't want the docs thinking you have too much in your system. They seem much quicker to reduce doses than to increase! maybe the fact I possibly didn't take my tablet today will skew my results a tad 😬

Oops! Oh dear, what a shame!!!

Bearing in mind that T4 takes 8 weeks to leave the body completely, a couple of days are neither here nor there in the scheme of things. You can take two tablets after your blood test.

I silly of me.

Ok, I was just gonna take the one after to be fair and then just carry on as usual

no no no never never never take any form of thyroid meds in the 24hours before a test

why is this? I always take my T4 at night time...I take 75 mcg of oroxine (T4) before bed at night, then go for a blood test the next morning about 10am.... is this not the best way of doing it. By the way do you fast overnight?? Or can I have breakfast before my TSH blood tests?? I get better results, that is, lower TSH when I have my breakfast and cup of tea before tests!

I don't know why either? I fast if the thyroid tests are included with lipid profile, etc. But no fast if only thyroid. Either way they should be near each other in range. Also I always take meds, blood test or not. I like to know if the med is effective.


sorry but you are incorrect .....

I follow my doctors suggestions, and she said it's ok to take the med on the day I am testing. What would be the point of skipping one dose when it takes 6 weeks or so to build up in your system>

ok so when you are still not well because your foctor has reduced orwont increase your dose please dont come back and grumble to us

we have all told you what the best advice is and it comes from the very few truly good endos there are who actually understand thyroid

so if you want to believe your doctors carry on

wow! thanks but no thanks. outta here

Wow, I am stunned by your answer. I thought this was a safe place, and yet you r saying don';t complain here if I have symptoms or dosage issues. I have NO problem calling mu dr. and getting increased or decreased. However, I will no longer contribute to this website, because hey, I might sound whiney. Thank you for you kind response.

What a shame my simple question seems to have turned.

We all have different symptoms and various responses to medication, it can be very subjective.

I was only diagnosed this June so this site was an unbelievable source I'd support and a wealth of advise.

I'm grateful for both your opinions, thank you both kindly.

I'll be posting my results in a few days as will be baffled by the results

'better results' depend on whose perspective you are looking from and whether you feel well on your current dose. For many people a lower TSH result is a bad thing because they are already undermedicated and want to be prescribed a higher dose, but their TSH is too low for the doctor to agree. In that case a 'better result' is a high TSH, so fasting before the blood test is a desirable thing, as is not taking medication for 24 hours before the test.

Sorry no

if you are hypothyroid you do not want a lower TSH because then your doctor will keep you on too low a dose of thyroid meds

never take thyroid meds in the 24 hours before a test and fast from after your evening meal till after the test which should always be done early morning when TSH is then highest

Didn't know that..

recently had a thyroid blood work,

So not even the GP is aware of or

Asks you to not take them before..

Unlike a fasting cholesterol test, they make sure you are informed

sadly GPs and even Endos are extremely ill informed about thyroid

Usual advice on ALL thyroid tests, (home one or on NHSu) is to do early in morning, ideally before 9am. No food or drink beforehand (other than water) If you are taking Levo, then don't take it in 24 hours before (take straight after). This way your tests are always consistent, and it will show highest TSH, and as this is mainly all the medics decide dose on, best idea is to keep result as high as possible

My very senior endo, was most insistent I should not take Levo in 24 hours before test. (Perhaps because they recognise there is an over reliance on TSH and also want to keep it as high as poss?)

I normally take at bedtime, but just delay until after early morning blood test. Still take next dose at bedtime later the same day.

TSH has been shown to have a fairly wide diurnal variation, and is highest very early in morning.

Thanks for the advise guys.

I will be leaving on an empty stomach shortly and no Levo taken.

Will be posting results when I get them for advise on interpreting them as no doubt my GP will say everything is good 😂

Take it AFTER not before.

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