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Doctor insights on: Thyroid Scan And Uptake Results

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Thyroid Scan (Definition)

The patient ingests radioactive iodine or has intravenous injection of radiotracer technetium to define structure, size, and function of thyroid gland. Overactive ( hyperthyroid) normal, and underactive thyroid glands are determined. Sometimes autoimmune conditions and tumors of the gland can be suspected. Correlative imaging ultrasound, mr imaging, and blood tests ...Read more


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How soon after a thyroid scan should you wait before an uptake scan?

How soon after a thyroid scan should you wait before an uptake scan?

One after the other: The exact scanning time after taking the capsule varies according to the isotope and protocol used. For i-123 and low i-131 the uptake and the scan is usually done at 24 hours. A thyroid probe directed to your neck measures the radioiodine uptake, this is follow by a gamma camera scan which makes an image of your thyroid gland based on the radioiodine distribution. ...Read more

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Single hot 1 CM nodule on thyroid scan with normal thyroid blood panels & uptake. Chances of malignancy?

Single hot 1 CM nodule on thyroid scan with normal thyroid blood panels & uptake.  Chances of malignancy?

Not likely: "hot" nodules are rarely cancer and most often represent benign follicular adenomas. These are also known as "autonomous" nodules because they make thyroid hormone but don't respond to the body's normal signals telling them when to stop making the hormone. The vast majority of thyroid cancer nodules are "cold" on a thyroid scan. ...Read more

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Just got the results of thyroid scan. The range is 5% to 30% in 24hrs. Mine's is 64% first day, 70% second day and 64.8% for the last day. Help!?

Just got the results of thyroid scan. The range is 5% to 30% in 24hrs. Mine's is 64% first day, 70% second day and 64.8% for the last day. Help!?

Hyperthyroidism: Your values of thyroid uptake are increased indicative of probable graves disease or hyperthyroidism especially if scan showed homogeneous enlarged thyroid.Sometimes oral medication is used to control hyperthyroidism.Sometimes medical therapy does not maintain control of disease. Some people have radioactive ablation of thyroid with i131which destroys gland, patient takes daily hormone supplements. ...Read more

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I'm due to have a thyroid scan in 3 days. Yesterday, I took two 25 mg antihistamine pills. Will this affect the results?

I'm due to have a thyroid scan in 3 days.  Yesterday, I took two 25 mg antihistamine pills.  Will this affect the results?

No, it should not.: The half life of most antihistamines should be less than 24 hrs and should be out of the system by then. I would check with the radiology center to confirm their policy. I would also avoid any more antihistamines until the time of testing. ...Read more

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I just got my results from my thyroid scan. What does bilateral hypoechoic nodules&cysts mean?

I just got my results from my thyroid scan. What does bilateral hypoechoic nodules&cysts mean?

It means: you have multiple fluid-filled of minimally cellular nodules and cysts, which are present in approx 50% of healthy normal individuals. Discuss the full findings with your doctor. ...Read more

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Test results are multinodular goiter so radionuclide thyroid scan?

Need more info: Not sure what you mean by "test results" but u cannot know that u have multinodular goiter from a blood test. A thyroid ultrasound can give u this diagnosis in which case u will need a blood test called TSH to know what to do next. No thyroid scan needed unless the TSH is low. Thyroid ultrasound vs. Biopsy might be needed depends on the size and characteristics of the nodules but need more info. ...Read more

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I had a radioactive thyroid scan. The results show an overproducing thyroid, with a pyramidal lobe, but my TSH came back at 4.3.Endocronologist next?

Likely Hashimoto's: You cant tell anything about thyroid function based on a thyroid scan. This is a common mistake made by radiologists. All you can assess is how much iodine is taken up by the thyroid gland and how it appears, not how much thyroid hormone is being produced. Your TSH is borderline elevated. The most likely cause for these findings in your age group is Hashimoto's thyroiditis. Seeing an endo is good ...Read more

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Thyroid scan/uptake shows mild hyperthyroidism, blood-work shows hypothyroidism. What's up with that?

Thyroid scan/uptake shows mild hyperthyroidism, blood-work shows hypothyroidism. What's up with that?

Labs are right: Thyroid scan/uptake shows how active someone's thyroid is in trapping iodine, but not whether or not their thyroid is able to convert iodide to iodine and make thyroid hormone with it. In this situation, the labs tell the true story - that the thyroid can't make enough thyroid hormone. Uptakes and scans are morehelpful in people with hyperthyroidism, and don't add much info in hypothyroidism. ...Read more

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Dr. Chad Levitt
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more