What does a normal thyroid uptake scan mean?

Radioactive thyroid scan and radioactive iodine uptake test (RAIU) Normal: The amount of radioactive tracer in the thyroid gland is normal. An RAIU test measures the amount of tracer taken up by the thyroid gland at certain times after the tracer is given.

Which scan is best for thyroid?

A CT scan can also be used to look for spread into distant organs such as the lungs. One problem using CT scans is that the CT contrast dye contains iodine, which interferes with radioiodine scans. For this reason, many doctors prefer MRI scans for differentiated thyroid cancer.

Is a normal thyroid visible?

The thyroid gland is located at the front of the neck just below the Adam’s apple (larynx). It is butterfly-shaped and consists of two lobes located either side of the windpipe (trachea). A normal thyroid gland is not usually outwardly visible or able to be felt if finger pressure is applied to the neck.

What is the normal thyroid uptake?

The normal values of thyroid uptake of radiotracer are 3 to 16% at 6 hours and 8 to 25% at 24 hours. These values may change according to laboratory standard techniques or patient dietary habits.

What is normal radioactive iodine uptake?

These are normal results at 6 and 24 hours after swallowing the radioactive iodine: At 6 hours: 3% to 16% At 24 hours: 8% to 25%

What is the normal size of thyroid nodule?


. Entire Cohort Evaluated Nodules
3.0–3.9 cm 1044 (11) 998 (14)
≥4.0 cm 794 (9) 773 (11)
Mean size, cm 2.6 2.3
Median size, cm 2.3 2.0

What are normal measurements of thyroid?

Normal thyroid lobe dimensions change from birth into adulthood: the length (L or craniocaudal) diameter is 1.8 to 2.0 cm in newborns and 4.0 to 6.0 cm in adults, while the A-P dimension measures 0.8 to 0.9 cm in newborns and 1.3 to 1.8 cm in adults.

What is the normal level of thyroglobulin?

The normal value for thyroglobulin is 3 to 40 nanograms per milliliter in a healthy patient. If a patient’s thyroglobulin level is found to be increasing after all of the thyroid gland has been removed, the patient may have a recurrence of a differentiated thyroid cancer.

How much thyroid is normal?

Low TSH levels usually mean that you’re producing too much thyroid hormone.

Age range Normal Low
18–30 years 0.5–4.1 mU/L < 0.5 mU/L
31–50 years 0.5–4.1 mU/L < 0.5 mU/L
51–70 years 0.5–4.5 mU/L < 0.5 mU/L
71–90 years 0.4–5.2 mU/L < 0.4 mU/L

Are there any ultrasound images of thyroid disease?

These sonographic findings are suggestive of De Quervain’s thyroiditis, also known as subacute thyroiditis. A 40 yr old male patient presented with midline swelling just above the isthmus of thyroid. Ultrasound imaging showed a normal orthotopic thyroid with normal sized lobes and isthmus.

What do you need to know about a thyroid scan?

It considers areas such as indications, what to tell the patient, what the test can and cannot tell you and interpretation of results. Thyroid scans are functional tests that assess the activity of the thyroid. This is in contrast to ultrasound, which provides information on gross morphology or biopsy that provides histological information.

Where does the ectopic thyroid appear on a CT scan?

Ectopic thyroid gland develops most commonly at sublingual (midline at foramen cecum), suprahyoid or infrahyoid position. USG shows presence of an ectopic thyroid tissue and the normal thyroid gland may or may not be present at normal position. Ectopic thyroid may be easily detected on CT and radionuclide scans.

How does a scintillation camera do a thyroid scan?

Tc-99m pertechnetate is injected intravenously into the arm and images of the thyroid are obtained with a scintillation camera approximately 20 minutes later. The radionuclide emits gamma rays (photons) at a predictable rate. The camera is set to detect a predetermined minimum number of photons.