I am a 64 year old male in good health (other than successfully treated hemochromatosis). Recently as part of a routine annual physical exam, I suggested to my doctor that I have my thyroid tested. I had never had it tested before, and because during the previous week I had been tired lately, felt chilly in the evening, had joint aches and pains, I thought perhaps my thyroid might be low. I had no other symptoms. Well, my test results came back yesterday showing that I do have a slight hypothyroid condition. Since then I have been second guessing myself: I note that joint pain is something that I've had for years and is typical with hemochromatosis; I wondered if my fatique may have been due to a recent therapeutic phebotomy and work stress; etc. Now before I go on a lifetime medication routine, I want to make sure that I indeed do have hypothyroidism.
Specifically what I want to know if having a large blood draw several days before the thyroid test draw could affect the thyroid levels in my blood? As part of my routine hemochomatosis treatment, I had therapeutic phebotomy, with a whole unit of blood drawn. This was done 4 days before I had the sample of blood drawn form my thyroid test. Could this relatively large quantity of blood drawn in my therapeutic pheblotomy had an effect on the thyroid levels in my blood 4 days later? Should I have the thyroid test take again in about a month or so?