What are the repercussions of overdosing on iodine?
There is a chance of this affecting your thyroid. This may be temporary or permanent.
With high doses of iodine such as this, initially it is likely to block the thyroid hormone production from your thyroid gland. This effect typically lasts for a few weeks.
In most cases, it does not reflect in the blood test ie the under-activity of the thyroid does not raise the TSH blood test result.
TSH is an indicator of thyroid function.
I would still recommend you have it checked along with your Free T4 in 6 weeks
Then in some instances, the thyroid feeds off the extra iodine load after several weeks of storing it. Iodine serves as a raw material for the 'manufacturing' of thyroid hormone.
So it is possible you may experience symptoms of 'hyperthyroidism' ie too much thyroid hormone in your blood.
The best way to detect this is again through the same blood test as above. This can be done at around 3 months or depending on when symptoms occur.
It will be most helpful for you to see an endocrinologist to guide you through this process.
When I see someone like you in my practice, I typically order the following blood tests in addition to a detailed physical examination:
CBC (Complete Blood Count, also known as Hemogram; includes Hemoglobin, WBC and Platelet counts)
Electrolytes (Sodium and Potassium in particular)
HbA1c (Glycosylated Hemoglobin = your 3 month glucose average)
Liver function tests (SGOT , SGPT, Albumin, Bilirubin, Alkaline Phosphatase)
Kidney function tests (BUN, Creatinine)
Anti Thyroid Peroxidase (TPO) antibodies
Anti Thyroglobulin antibodies
25 hydroxy Vitamin D
None of these tests require any fasting and can be done at any time of the day
While it is not as if you are destined to have permanent damage, it is a possibility. There is no way to predict the outcome in your case individually. Various potential results occur from person to person.
The only thing one can do about this is to monitor thyroid function periodically via blood tests and follow up with a thyroid expert regularly to see where your thyroid is headed.