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.
Depends. Nuclear scan can be used following ultrasound to see if nodule detected by US is hypo or hyper functioning. Thyroid cancer is more prevalent with hypofunctioning nodules but can occur with both types.In any way if nodule greater than 1.5 cm should be biopsied. Nuclear scans are commonly used to assess hyperfunctioning thyroid gland and used prior to radiation abation therapy for Graves disease.
Tests. The ultrasound is the best test for determining thyroid size and nodule characteristics. The scan can help determine risk for cancer. A better test than the scan is needle biopsy. The biopsy is ther most definite test short of major surgery.

Related Questions

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

Thyroid scan vs sono. The nuclear scan and the ultrasound of the thyroid are used for different reasons so one is not "better" than the other. The nuclear scan assesses the activity of the thyroid and can assess size and if the thyroid is over or underactive. The sonogram can assess the size and look for changes in density showing the presence of cysts and solid tumors. Read more...
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...

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

Not really. The half-life of the tc99m used in most scans is such that you are radiation free in 24hrs. Also, the amount used is very small. Don't worry. Read more...
It depends. Thyroid scans can be done with three different isotopes - most often technetium(tc-99) or iodine (i-123). Scans done to monitor patients with a known history of thyroid cancer use iodine(i-131). Tc-99 decays quite rapidly, but i-123 takes a few days to decay, and i-131 can persist at low levels for several weeks. Low doses are used, that are safe for patients and those around them. Read more...
Depends on isotope. Different isotopes have different physical half-lifes. In the us, a thyroid scan should ideally be performed using i-123 which has a half-life of 13.2 hours. Some places use a low dose of i-131which has a half-life of 8 days or tc-99m which has a half-life of 6 hours. The radioactivity used in this study is low, however the rule of thumb is 10 half-lifes for all activity to decay. Biology is also. Read more...
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...

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

Test. Uses: hyperthyroid patients, following thyroid cancer, and as a prelude to receiving radioactive iodine to treat thyroid cancer. Should not be used routinely to work up thyroid nodules. Read more...
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...

How is a thyroid nuclear scan done?

Varies. A thyroid uptake and scan may be done with different isotopes and protocols resulting in scan time variation. Typically is done with i-123; you take the capsule one day and you come back the next day at 24 hr for a neck scan that takes aprox 15-20 minutes. In certain circumstances some places do this scan at 4-6 hours after you take the capsule. Some places do the scan with pertechnetate. Read more...

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...
Thyroid imaging. A thyroid nuclear scan is an imaging study of the thyroid gland using radioiosotopes such as iodine 131, iodine 123, or 99mtc-pertechnetate. Following administration of one of these radioisotopes, a scan of the neck is performed to detect nodules or to evaluate the metabolic status of the thyroid, for example. Read more...
Thyroid function. 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 are used for confirmation. Read more...

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...
Best avoided. The thyroid scan depends upon the attraction of the gland for iodine. Sea salts are frequently rich in iodine which can interfere with the test. Best to hold off on this and iodized salt for several days prior to a thyroid nuclear scan. Read more...

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

Regular salt is OK. Salt without iodine (if you can find it is ok). The scan requires a low iodine diet. Read more...
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...

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

7days. Patient s should be on low iodine diet for one week before the the scan. Read more...
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...