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I have a TSH 0.004. Other blood levels are within normal range. T3 is high normal. I've always been borderline hypo/have thyroid nodules for years. Went off armour thyroid a year ago and my TSH never recovered or rose. ENT had me in suppression. I have come to learn this was wrong as my initial readings were normal.
Because of low TSH, my current doctor ordered a radioiodine uptake for next week. I have underlying past medical issues and have been researching the different types and doses of this nuclear pill. Please post any info and or experience you've had with the thyroid scan. Any side effects? Which type were you given? 131 is 100 times more potent than 123 from what I understand yet for a routine scan this radiologist says they use 131 with 200 mcg. Cancer is not a consideration. I've had biopsies and ultrasounds.
I'm concerned this nuclear pill could trigger the return of: (all resolved for years) tachycardia, occular migraines, tinnitus, vertigo.
I've been under great stress and trauma from the illness and loss of my husband last year. A week after he passed I began getting things I've never heard of like PVD (vitreous detachment/normal) but mine was accompanied by retinal bleed. Had it in both eyes. Labrynthitis causing severe and extended vertigo then dizziness for 3 months. Return of occular migraines one of which hit my speech center of brain causing stroke-like symptoms. ER diagnosed another type of migraine aura.
I thought I was finished with all this illness stuff when a blood test showed the low TSH. I don't feel physically ill or hyperthyroid at all. I have no symptoms. I have read that chronic stress and trauma and virus can trigger thyroid issues. I've had all for the past year.
To the uptake scan. I believe the radiologist associated with my PCP group is using I 131. She mentioned 200 mcg. Here is what I found.
Because123 I has a comparatively short half-life and emits only (gamma) photons, it is ideal for diagnostic testing.131 I has a half-life of 8 days and emits beta rays as well as gamma rays. This makes it useful for diagnostic and therapeutic purposes. But the use of131 I for routine diagnosis is discouraged because the radiation dose is about 100 times stronger than that of123 I.
Other noniodide radionuclides are used for the evaluation of patients with thyroid disorders include the following:
Technetium pertechnetate (99mTcO4): This is more widely used than 123 I because of availability and cost.  Unlike 123 I, which is both concentrated and organified within the thyroid, technetium pertechnetate is only concentrated in the thyroid.
Thank you for any advice, support, information.
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