Top
20
Doctor insights on: Thyroid Nuclear Scan

Share
Dr. Guido Davidzon
26 Doctors shared insights

Thyroid Nuclear Scan (Overview)

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.


Dr. Guido Davidzon
26 Doctors shared insights

Thyroid Nuclear Scan (Overview)

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.


2

2
No risk for thyroid nuclear scan?

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

3

3
Coping with Nuclear or Radioactive Releases (Checklist)

Listen to instructions from the Emergency Broadcast Network
daily
if you must shelter in place, duct tape all outside doors, windows, and chimneys
once
Have a week's worth of rations, water, and iodine pills if at high risk
once
Have batteries, flashlight, transistor radio, and first-aid kit handy
once
5

5
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

6

6
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

7

7
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

8

8
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

9

9
Is sea salt ok before thyroid nuclear scan?

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

10

10
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

11

11
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

12

12
Is a thyroid nuclear scan considered to be a treatment or just a test?

Is a thyroid nuclear scan considered to be a treatment or just a test?

Just a test: A thyroid uptake and scan is used to aid the differential diagnosis of newly diagnosed thyrotoxicosis and ideally should use i-123 as the radiopharmaceutical (low energy isotope for testing). If the test shows increased thyroid function such as in grave's disease or multi-nodular goiter i-131 can be use to ablate the thyroid gland if this is desire. ...Read more

13

13
Is thyroid nuclear scan a better investigation than ultrasound?

Is thyroid nuclear scan a better investigation than ultrasound?

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

14

14
Question on thyroid nuclear scan/ can I have it if I might be pregnant?

Question on thyroid nuclear scan/ can I have it if I might be pregnant?

Get a pregnancy test: If in doubt, the safest thing will be to get a pregnancy test before any testing that involves radiation. This is true for nuclear medicine or radiologic studies. ...Read more

15

15
5.58 TSH level a month ago with one hot nodule and normal thyroid uptake found on nuclear scan from friday. Not on hormone therapy. Please explain?

If you had a "hot": Nodule, your TSH would be low not high and your thyroid uptake would probably be elevated as well, the so-called nodule may be the only area of your thyroid that is functioning appropriately. Depending upon other factors and other lab, you may have had recent thyroiditis or may even need thyroid replacement. Check w/your doctor and/or consider a thyroid specialist. ...Read more

16

16
I just found out via nuclear scan that I have a 2cm heteoeneous nodule of the anterior right lobe of my thyroid. Is this something I should be worried?

Needs biopsy: Nodules in thyroid gland mostly benign. However nodule greater than 1 cm needs to be biopsied. Ultrasound would better characterize type of nodule cyst or solid. Usually needle biopsy by interventional radiologist or surgeon. Smaller nodules are watched periodically by ultrasound. ...Read more

17

17
I have two thyroid nodgules 1.9cm and 2.1cm I have had nuclear scan and biopsy both came back noncancerous. What would be next treatment if get bigge?

I have two thyroid nodgules 1.9cm and 2.1cm I have had nuclear scan and biopsy both came back noncancerous. What would be next treatment if get bigge?

If they grow: Hi. If the nodules get bigger, they should be needle biopsied again. Even if they stay the same size, some people would routinely biopsy again in a year or so. But grown is a definite need to re-biopsy. Good luck! ...Read more

18

18
I had an ultrasound on my thyroid on 12/2 and today my dr office called and said they want me to go for a nuclear scan. Should I be worried?

Thyroid scan...: Did you have thyroid function tests (blood tests)? There are various reasons to order a thyroid scan. Thyroid scans can be helpful in diagnosing thyroiditis, graves disease, hyper functioning nodules, or thyroid cancer. Ultrasound shows the anatomy but thyroid scan shows the function. If they saw nodules on ultrasound, the thyroid scan will determine if the nodules are hyper/hypo functioning. ...Read more

19

19
After having blood work an ultrasound for thyroid nodgel. My doc was a little worried so I had a nuclear scan done. Result normal? Wat does that mean

After having blood work an ultrasound for thyroid nodgel. My doc was a little worried so I had a nuclear scan done. Result normal? Wat does that mean

Do not worry: The ultrasound study probably showed one or more nodular structures within the thyroid gland. These are mostly benign nodules, but a few are malignant. In the nuclear study, benign nodules take up the activity similar to normal thyroid tissue, and malignant do not, resulting in a cold area relative to the remainder of the gland. Apparently, you did not have a cold nodule. You only need watching. ...Read more

20

20
How long do I have to wait after a nuclear medicine thyroid scan, i-123, to have a fna biopsy and/or thyroid blood tests?

How long do I have to wait after a nuclear medicine thyroid scan, i-123, to have a fna biopsy and/or thyroid blood tests?

You don't wait.: Generaly speaking you do not need to wait at all after having an I 123 thyroid scan to have a biopsy. You usually have the biopsy scheduled after the results of the thyroid scan are interpreted which usually takes a day. The radiation from the I 123 is minimal. ...Read more

Dr. Guido Davidzon
112 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. Lonnie Smith
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