How long can an individual who's had a total thyroidectomy go without any thyroid medicine before having organ failure, myxedema coma, etc.?

Low thyroid surgery. F of unknown age or medical Hx asks: How long can an individual who's had a total thyroidectomy go without any thyroid medicine before having organ failure, myxedema coma, etc.? ANS: low thyroid is evident by 4-6 weeks. It may take months to develop myxedema and its complications.