What companies might be best for this test please? however, need a blood draw not a fingerprick draw as it doesn’t suit me.
Blood test with reverse T3 and thyroid antibodies - Thyroid UK
Blood test with reverse T3 and thyroid antibodies

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TiggerMeAmbassador
We don't recommend testing reverseT3 as it doesn't tell you anything useful, it is just T4 that has been inactivated
Here's a chat about it...
Blue Horizon. Reverse T3 waiting time for results is 3 weeks which is pretty standard.
Just to say I've used Blue Horizon for this test and everything went very smoothly. The only thing which wasn't OK was the instructions which are a bit contradictory as to who posts the blood back to the company. It's your responsibility to post the package back to Blue Horizon.
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