Hi,
I was sent for a hysterosalpingogram (HSG) after my miscarriage. The HSG uses an iodine contrast dye that is injected into the uterus. My gyn is aware that I have Grave disease and am allergy to shellfish. I was euthyroid before the HSG procedure. 2 weeks after the HSG, my TSH decreased from 1.47 to 0.04. My Ft4 and Ft3 increase from mid range to the upper range.
My question is does HSG trigger a new episode of grave disease? When I confronted my gyn, I was told that the iodine in HSG is very little compared to those high doses of contrast dye for CT scan (iodine injected into the blood vessel). How true is this? I read from the web that euthyroid patients previously treated with antithyroid drugs for Graves' disease are prone to develop iodine-induced hyperthyroidism. How high is the iodine content in HSG and can this affect the thyroid?
If HSG can affect the thyroid, why am I sent for this risky procedure since I have Grave disease?