I am having a blood test this morning., in preparation for my endo appointment in a few weeks. T3 was not requested by the endo, but I have been in contact with her secretary, explained that my ferritin is low, and the secretary has agreed to add t3 on to the form when I arrive today. Just checking, is t3 useful or will she need to say free t3 (don't want to push my luck with her if I don't need to!). Thanks
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