Thyroid scintigraphy is a nuclear medicine procedure that produces a visual display of functional thyroid tissue based on the selective uptake of various radionuclides by thyroid tissue.

How is thyroid scintigraphy done?

A nuclear medicine thyroid scan uses a radioactive medication (radiopharmaceutical) to take pictures or images of the thyroid gland. The radiopharmaceutical is injected into a vein, usually in the arm, and enters the thyroid gland from the circulating blood.

What is the purpose of a thyroid scan?

The thyroid scan is used to determine the size, shape and position of the thyroid gland. The thyroid uptake is performed to evaluate the function of the gland. A whole-body thyroid scan is typically performed on people who have or had thyroid cancer.

Which scan is best for thyroid?

Computed tomography (CT) scan

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.

What can I expect from a thyroid uptake scan?

During Your Exam

On your first visit, you will swallow a small radioactive iodine capsule. On your second visit (four hours after taking the capsule), you will have an uptake measurement, pictures of your thyroid gland and an examination of your thyroid gland by the nuclear medicine physician.

Scintigraphy

16 related questions found

What are early warning signs of thyroid problems?

Early signs of thyroid problems include:

• Gastrointestinal problems. ...
• Mood changes. ...
• Weight changes. ...
• Skin problems. ...
• Sensitivity to temperature changes. ...
• Vision changes (occurs more often with hyperthyroidism) ...
• Hair thinning or hair loss (hyperthyroidism)
• Memory problems (both hyperthyroidism and hypothyroidism)

What does an abnormal thyroid uptake scan mean?

An abnormal thyroid scan may show a thyroid that's enlarged or out of position, indicating a possible tumor. Abnormal measurements also may show that your thyroid gland collected too much or too little of the radionuclide.

What are the 3 thyroid tests?

Available tests include the T3, T3RU, T4, and TSH. The thyroid is a small gland located in the lower-front part of your neck. It's responsible for helping to regulate many of the body's processes, such as metabolism, energy generation, and mood.

What blood test is for thyroid?

Thyroid function test

A blood test measuring your hormone levels is the only accurate way to find out whether there's a problem. The test, called a thyroid function test, looks at levels of thyroid-stimulating hormone (TSH) and thyroxine (T4) in the blood. Doctors may refer to this as "free" T4 (FT4).

What's a good TSH level?

The normal range of TSH levels in adults is between 0.4 to 4.0 mIU/L (milli-international units per liter). Some research suggests that this range should actually be more like 0.45 to 2.5 mIU/L. The TSH range may also vary slightly based on the testing facility where your blood is being analyzed.

What is scintigraphy used for?

Skeletal scintigraphy is a special type of nuclear medicine procedure that uses small amounts of radioactive material to diagnose and assess the severity of a variety of bone diseases and conditions, including fractures, infection, and cancer.

What is the principle of thyroid scan?

The thyroid uptake and scan is a radiologic diagnostic tool used to determine the thyroid function and pathologies. This diagnostic procedure works on the principle of the unstable nuclide of the atom, which tries to attain stability by releasing an alpha, beta, and gamma rays.

What is a thyroid uptake?

A thyroid uptake and scan is a diagnostic imaging scan that allows the radiologist to determine the function of the thyroid. This scan can determine if the patient has thyroid cancer: persistent or recurrent disease, hyperthyroidism and thyroid nodule or goiter assessment.

What are the long term side effects of radioactive iodine?

Possible long term side effects include:

• Ability to have children (fertility) Some women may have irregular periods after radioactive iodine treatment. ...
• Inflammation of the salivary glands (where spit is made) ...
• Tiredness. ...
• Dry or watery eyes. ...
• Lower levels of blood cells. ...
• Lung problems. ...
• Second cancers.

What is the pill given for thyroid scan?

The test is done in this way: You are given a pill that contains a tiny amount of radioactive iodine. After swallowing it, you wait as the iodine collects in your thyroid. The first scan is usually done 4 to 6 hours after you take the iodine pill.

How do radiotracers work?

How It Works. A radiotracer is injected, swallowed, or inhaled and then eventually accumulates in the area of the body under examination. A special camera or imaging device is used during this process and will detect the radioactive emissions from the radiotracer.

Do you have hypothyroidism look at your hands?

Signs and symptoms of hypothyroidism can show up in the hands and nails. Hypothyroidism can cause dermatologic findings such as nail infection, vertical white ridges on the nails, nail splitting, brittle nails, slow nail growth, and nails lifting up.

Why is thyroid caused?

Problems with the thyroid can be caused by: iodine deficiency. autoimmune diseases, in which the immune system attacks the thyroid, leading either to hyperthyroidism (caused by Graves' disease) or hypothyroidism (caused by Hashimoto's disease) inflammation (which may or may not cause pain), caused by a virus or ...

What should a thyroid patient eat?

Thyroid and diet factsheet

• eat at least 5 portions of a variety of fruit and vegetables every day.
• base meals on higher fibre starchy foods like potatoes, bread, rice or pasta.
• have some dairy or dairy alternatives.
• eat some beans, pulses, fish, eggs, meat and other protein.

What is T4 and T3?

T3 is one of two major hormones made by your thyroid, a small, butterfly-shaped gland located near the throat. The other hormone is called thyroxine (T4.) T3 and T4 work together to regulate how your body uses energy.

What is TSH T3 and T4?

When the level of thyroid hormones (T3 & T4) drops too low, the pituitary gland produces Thyroid Stimulating Hormone (TSH) which stimulates the thyroid gland to produce more hormones. Under the influence of TSH, the thyroid will manufacture and secrete T3 and T4 thereby raising their blood levels.

What are normal T3 and T4 levels?

These levels are influenced by many factors that affect protein levels in the body, including medications, sex hormones, and liver disease. A normal Total T4 level in adults ranges from 5.0 to 12.0μg/dL. A normal Total T3 level in adults ranges from 80-220 ng/dL.

What is a normal thyroid level reading?

Normal test range for an adult: 0.40 - 4.50 mIU/mL (milli-international units per liter of blood). T4: thyroxine tests for hypothyroidism and hyperthyroidism, and used to monitor treatment of thyroid disorders. Low T4 is seen with hypothyroidism, whereas high T4 levels may indicate hyperthyroidism.

What does high thyroid uptake mean?

A high uptake of tracer spread evenly in the thyroid gland may mean that hyperthyroidism is caused by conditions such as Graves' disease.

What do cancerous thyroid nodules look like on an ultrasound?

A malignant thyroid nodule tends to have ill-defined margins on ultrasound (Fig. 1). A peripheral halo of decreased echogenicity is seen around hypoechoic and isoechoic nodules and is caused by either the capsule of the nodule or compressed thyroid tissue and vessels [31].