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Doctor insights on: Hypo Functioning Adenoma On Thyroid Nuclear Scan

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Dr. Guido Davidzon
24 doctors shared insights

Thyroid Nuclear Scan (Definition)

This scan involves taking orally a small dose of radioactive iodine. The iodine is taken up by the thyroid and produces an image. "cold" areas are places with no iodine uptake. "hot" areas have a lot of uptake. The radiologist also calculates the percent uptake of the iodine. This test is important in the diagnosis of hyperthyoidism, thyroid cancer, and follow ...Read more


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What is the definition or description of: thyroid nuclear scan?

What is the definition or description of: thyroid nuclear scan?

Thyroid scan: This scan involves taking orally a small dose of radioactive iodine. The iodine is taken up by the thyroid and produces an image. "cold" areas are places with no iodine uptake. "hot" areas have a lot of uptake. The radiologist also calculates the percent uptake of the iodine. This test is important in the diagnosis of hyperthyoidism, thyroid cancer, and follow up of thyroid cancer. ...Read more

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What does abnormal uptake on a thyroid nuclear scan mean?

What does abnormal uptake on a thyroid nuclear scan mean?

Several things: The result of a thyroid uptake test could be abnormally increased or decreased. In the usa, the normal thyroid uptake range is approximately 10-30% at 24 hours. An increased result may be due to various reasons including: grave's disease, multinodular toxic goiter or hashitoxicosis. A decreased uptake could be due to subacute thyroiditis, iodine or amiodarone induced thyrotoxicosis among others. ...Read more

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Question on thyroid nuclear scan - do you stay radioactive for a while?

Question on thyroid nuclear scan - do you stay radioactive for a while?

Usually 2 days: Half life for radiotracers used to image thyroid is 6 hours for Tc99m pertechnetate and 13 hours for Iodine 123. Usually two days after dose, no appreciable residual activity. ...Read more

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How long do I have to be on a low iodine diet for thyroid nuclear scan?

How long do I have to be on a low iodine diet for thyroid nuclear scan?

2 weeks: A low-iodine diet should usually be followed for 2 weeks prior to a thyroid whole-body scan. The rationale behind this is to reduce the chances of non-radiactive iodine (in food and table salt) to compete with the radioactive active iodine use for diagnosis (i-123) and treatment (i-131). ...Read more

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No salt (or just no iodinated salt) for thyroid nuclear scan?

No iodinated salt: The thyroid uptake and scan measures the ability of your thyroid gland to accumulate a radioactive form of iodine (usually i-123). Table salt or seafood contain iodine (a non-radiactive one) that compete with the radioactive iodine use during the test and thus could falsely bias the results. You can use kosher salt which doesn't have the added iodine as in regular salt. ...Read more

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No risk for thyroid nuclear scan?

None.: The amount of tc99m or iodine given is a small dose and does not pose a health risk for a radioactive thyroid scan. ...Read more

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Is sea salt ok before thyroid nuclear scan?

Sometimes: Most scans in the us use radioiodine. In this situation, table salt which contains iodine will interfere with the scan; sea salt generally contains very little iodine and should not interfere much with the test. If you get a tc99m pertechnetate thyroid scan, which is more commonly used in europe, sea salt before the scan is ok. ...Read more

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Is thyroid nuclear scan a better test than ultrasound of the thyroid ?

Is thyroid nuclear scan a better test than ultrasound of the thyroid ?

Different no better: A thyroid nuclear uptake and scan is a functional test of your thyroid. It is useful in differentiating causes of thyrotoxicosis (excessive amounts of thyroid hormones in the body). A thyroid ultrasound is better to assess the anatomy of the thyroid gland and for guidance if biopsy is needed. ...Read more

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Dr. Guido Davidzon
111 doctors shared insights

Nuclear Scans (Definition)

From a cardiac perspective nuclear scans are performed with either exercise or medications to examine the blood flow in the heart. Before and at peak exercise the patient is given a radio tracer which travels in the blood to the heart. Pictures are take before and after exercise and compared to evaluate for any blockages in the ...Read more


Dr. Cornelius O'leary jr
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