t3 before blood test

[mstp]

Hi I am on T3 only and am having a blood test next week. I have read on here that it is a good idea to take T3 in small doses the day before but I can't recall the exact details or reasoning. At the moment I take about 60mcg in one dose first thing in the morning. Please could someone advise me what to do the day before.

[SeasideSusie Remembering]

mstp

The advice for T3 is to take last dose 8-12 hours before the test. I'm on Levo and T3 and normally take it all together in the early hours of the morning but when testing I split the T3 into 2 doses and take first dose with Levo and second dose I time so it's between 8-12 hours before test. General advice is to split the T3 into 2 or 3 doses the day before. You're on quite a high dose of T3 so if you took the whole of that 8-12 hours before it may be that you'd get a higher result for FT3 than if you spread the dose out during the day (nothing official about that, just my thoughts as I'm not in the same position as you).

Is this a private test for yourself or a GP test?

[mstp in reply to SeasideSusie]

Thanks SeasideSusie. It is a test done through my GP which I have asked for because I am hoping to buy my T3 from the Roseway Pharmacy in the future. For years I have been on Cynomel from Mexico but there seems to be problems with accessing it now so I am taking the plunge and changing my brand. Slightly concerned but hoping for the best.

[SlowDragon Administrator in reply to mstp]

Suggest you split as 3 x 20mcg day before test

Taking 20mcg waking, early afternoon and last dose at 9pm

Also request testing of vitamin D, folate, B12 and ferritin

[mstp in reply to SeasideSusie]

Hi again, on reflection I am a bit puzzled why you mentioned all the t3 being taken 8 to 12 hours before the blood test not being a good idea. As I take it first thing in the morning, my usual dose would be about 26 hours before the blood test at 9am. Sorry to point this out but I'm wondering if it would affect the advice you've given.

[SeasideSusie Remembering in reply to mstp]

This is what I said

You're on quite a high dose of T3 so if you took the whole of that 8-12 hours before it may be that you'd get a higher result for FT3 than if you spread the dose out during the day (nothing official about that, just my thoughts as I'm not in the same position as you).

SlowDragon has also advised to split dose but the choice is yours.

[mstp in reply to SeasideSusie]

Sorry perhaps I did not explain it very well. What I mean is, why shouldn't I take it 24 hours before - ie at my usual time?

[HypoZona]

I take T3 only, 55mcg/day, i tried various methods and found this to be most effective: 25 in am, 20 mid day, 10 at night. I use this same method the day before i have blood work, and don’t take anything the morning of the appointment. Side note: a one time dose of 60mcg seems high based on my personal experiments, and that would definitely give me HypEr symptoms for a few hours. Not many people understand rT3, (reverseT3); this is when the T3 is not absorbed properly and will complete with other T3 for cellular connection and absorption. Worth looking up and reading about. Since you take a larger dose of T3 at one time see if you can have them also check your rT3, they probably will say that is worthless, but this test really helped me when i was put on T3 only and had to find my optimal dose and timing, which took a few weeks of experimenting. Also, definitely check vitamin D, B12, ferritin, folate, iodine ( i am in the states, so different tests are available) The more information you have with taking T3 only the faster you will find you optimal dosing/timing, and eliminating symptoms is the name of the game. So journaling symptoms as you navigate through this is a huge help.

[tattybogle]

if you test 24 hrs after taking full daily dose of T3, you can't tell whether your fT3 is in range for most for the day, which is fine , or whether it's over range for most of the day ... which is possibly a bit more risky .

most people don't worry too much if thier fT3 peaks over range for just the first 5/6 hours after taking the dose ... but by 8-12 hrs after taking the dose they would (ideally) want it to be back in range .

but if you wait 24 hrs to test ,, then even if fT3 is back in range at that point , you have no idea if it was over range at 12 hrs, or even at 18hrs... and if it was , you would be running your body with an over range fT3 for most of the day, every day, and not knowing about it .

healthunlocked.com/thyroidu... suggested-thyroid-hormone-test-timing-protocols