When to take t3 before blood test on t3/t4 combo? - Thyroid UK

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When to take t3 before blood test on t3/t4 combo?

liaratsoni profile image
4 Replies

Hi everyone,

I have a blood test tomorrow - my first on a combo t3/t4 dose and I am very confused about when to take t3. I know to stop levo 24hrs before but I have seen conflicting information about taking t3 - I currently take 10mcg split into two 5mcg doses one at 9am and one at 3.30pm. My blood test tomorrow is at 1.10pm so roughly 4hrs after I take my first dose. Should I take the 5mcg dose in the morning of will this mean that my blood will be drawn when t3 is at a peak and give me a false high? Thank you!

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liaratsoni
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Lalatoot profile image
Lalatoot

T3 to be taken 8 - 12 hours before blood test. Count back 8 hours from 1pm and take your morning dose then.

liaratsoni profile image
liaratsoni in reply to Lalatoot

Thank you!

yesendi profile image
yesendi

If this helps, I always take my T3 right at midnight and test at 7:30 -8:00 AM

liaratsoni profile image
liaratsoni in reply to yesendi

Thank you! thats good to know as the same time frame I took mine before the test!

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