Do you sometimes feel tired, or lose or gain weight for no reason? You may think that this is just something else. However, these symptoms can be caused by some changes in the thyroid gland, a small butterfly-shaped gland in our body. So, today we will talk about what these thyroid tests are, how they are done, and when they are done. There is nothing to be afraid of, these are very simple tests.
What are Thyroid Tests?
Simply put, thyroid tests are a series of tests that check whether your thyroid gland is working properly. Now you may be wondering what the thyroid gland is. It is a small, butterfly-shaped gland located in your neck, just below the collarbone, just above the sternum/breastbone. It acts as the master control center for how our body uses energy. It is like a command center!
If you feel tired, lethargic, or just plain restless, irritable, or have unexplained weight changes (gain or loss), your doctor may recommend a thyroid test. These tests can help diagnose several thyroid-related conditions. For example:
- Decreased function of the thyroid gland, that is, hypothyroidism .
- Increased activity of the thyroid gland, that is, hyperthyroidism .
- Inflammation of the thyroid gland, that is , thyroiditis .
- Graves' disease .
- Hashimoto's disease .
These are also called thyroid function tests.
What types of thyroid tests are there?
There are two main types of thyroid tests. Let's take a look at what they are.
1. Thyroid blood tests: These measure the hormones and antibodies in your blood. This can help determine if you have conditions like hypothyroidism or hyperthyroidism. TSH, T3, T4, and thyroid antibody tests fall under this category.
2. Thyroid imaging tests: These tests can help your doctor see if you have any lumps (nodules) in your neck and whether they are cancerous (malignant) or benign (benign). These tests include tests like a thyroid uptake and scan. In some of these tests, you are given a small amount of a special liquid (contrast material) to drink or inject.
How does this blood thyroid test work?
Thyroid blood tests measure the levels of certain hormones and antibodies in your blood. If these hormones or antibodies are too low or too high, it means you may have a thyroid disorder. Okay, now let's look at what these main blood tests look for:
- TSH test: This measures your thyroid-stimulating hormone (TSH). This is often the first test that doctors recommend. This hormone, TSH, is produced by the pituitary gland in your brain. From there, this TSH hormone travels to the thyroid gland and stimulates it to make thyroid hormones (T3 and T4).
- T3 (or free T3) test: This measures the amount of a hormone called triiodothyronine (T3) in your blood. This is one of the two main hormones made by the thyroid gland.
- T4 (or free T4) test: This measures the amount of a hormone called thyroxine (T4) in your blood. This is the other main hormone made by the thyroid gland.
- Thyroid antibody tests: This test can tell your doctor if you have thyroid antibodies in your blood. If you have these antibodies, it could mean that you have an autoimmune disorder, such as Graves' disease or Hashimoto's disease.
Do I need to prepare before the blood test?
Usually, you don't need to do anything special before this blood test. You can eat and drink normally unless your doctor tells you otherwise. However, sometimes you need to tell your doctor about any medications you are taking, as some medications can affect the results of this test.
What happens during a blood test?
It's very simple. A nurse or doctor will take a small sample of blood from a vein in your arm. Then they'll send that blood sample to a lab to be tested. Once the lab is done testing, the results will be sent to the doctor who ordered the test for you.
After the blood test?
Your doctor will talk to you about these results. They may also order additional tests if they need more information. They will also explain what your results mean and what to do next.
How do thyroid imaging tests work?
Thyroid imaging tests can give your doctor more information about the size, shape, and function of your thyroid gland. Doctors often recommend these imaging tests after blood tests. Let's take a look at what they are.
- Thyroid ultrasound: This uses sound waves to look at the shape, size, and location of the thyroid gland. During this test, your doctor will place a handheld device on the skin of your neck and move it around. The device sends sound waves into your body and analyzes the waves that bounce off your thyroid. It is often used to find lumps (nodules) in your neck.
- Thyroid scans: This uses CT (Computed Tomography) scanning technology to look at the size and position of the thyroid gland. Often, the doctor uses a special substance called contrast material to help see any problem areas clearly. This substance reduces the amount of X-rays that pass through your body, allowing for clearer pictures. This involves either injecting radioactive iodine into your vein, or giving you a pill to swallow before the test. Sometimes the scan can be done without contrast material, but it is less common.
- Thyroid uptake tests: These check how well your thyroid gland is working. Four to six hours before the test, you swallow a small amount of radioactive iodine (either as a liquid or as a pill). When you arrive for the test, you will be seated in a chair and the doctor will place a device called a gamma probe on the front of your neck. (A gamma probe is a handheld device that measures how much iodine your thyroid gland is taking up from the blood.) This is painless and only takes a few minutes. You will usually be checked again 24 hours later. If your thyroid gland is taking up too much iodine, you may have hyperthyroidism or Graves' disease. If you absorb very little iodine, you may think you have hypothyroidism or Hashimoto's disease.
Do I need to prepare in advance for imaging tests?
If your doctor is going to use a contrast material, you may be asked to stop eating or drinking for a few hours before the test. Or, you may be asked to avoid foods high in iodine, such as kelp.
Important: The instructions you are given may vary depending on your condition. Therefore, your doctor will tell you exactly if you need to make any special preparations. It is very important to follow those instructions.
What happens after an imaging test?
The radiologist will send your imaging results to the doctor who ordered the test. After reviewing the scans, the doctor will talk to you about them and what to do next.
If your scan shows a lump in your neck, your doctor may ask you to have a needle biopsy , also known as an FNA (Fine Needle Aspiration). This will help determine whether the lump is cancerous or not.
How long does it take to get thyroid test results?
After your doctor reviews your thyroid test results, they will either call you to let you know or ask you to come back to the office. This usually doesn't take more than a few days. However, this can vary slightly depending on the lab's workload.
What blood tests show thyroid function?
Doctors use several blood tests to check thyroid function. The two most common tests are TSH (thyroid-stimulating hormone) and T4 or free T4 (thyroxine) levels .
Sometimes doctors also recommend a full thyroid blood test panel.
What is in a Full Thyroid Panel?
A complete thyroid blood test panel measures the levels of the following hormones and antibodies in your blood:
- TSH (thyroid stimulating hormone)
- T3 or free T3 (triiodothyronine)
- T4 or free T4 (thyroxine)
- TPO (thyroid peroxidase antibodies), also called microsomal antibodies.
- TG (thyroglobulin)
- TGAb (thyroglobulin antibodies)
- TSI (thyroid-stimulating immunoglobulin)
Whether or not all of these are considered at once depends on your symptoms and your doctor's decision.
What happens if my TSH level is high?
If your TSH level is high, it could mean you have hypothyroidism . This means your thyroid gland is not producing enough thyroid hormones.
On the other hand, if your TSH level is low, it could indicate hyperthyroidism . This is when your thyroid gland is producing too much thyroid hormone.
Remember: Your doctor will explain to you what these results mean and how they affect your health. Don't jump to conclusions based on what you read on the Internet.
What things can affect thyroid test results?
Yes, there are some things that can affect your thyroid test results, so it's good to be aware of these as well:
- Certain medications and supplements: Some medications you take (e.g. biotin) can affect thyroid test results. So tell your doctor about all medications and vitamins you take.
- Time of thyroid medication: If you are already taking thyroid medication containing T3, the gap between when you last took the medication and when you donated blood can affect the results.
- Whether or not to take the test: This only affects thyroid scans. It usually does not affect blood tests.
- Stress: Excessive stress, or the effects of another medical condition, can sometimes have a small impact on the results.
Do I need to fast for a thyroid test?
This also depends on what kind of test you're having. Most doctors don't recommend fasting before a thyroid blood test. However, for thyroid scans, especially if a contrast material is used, you may be asked to stop eating and drinking for a few hours before the test.
Your doctor will let you know in advance whether you need to fast or make any other preparations.
Finally, things to remember
An overactive or underactive thyroid can affect our daily lives and quality of life. If you have symptoms of thyroid disease, a thyroid test like this can help determine the exact cause. It will then be easier for your doctor to recommend the most appropriate treatment for you.
So, don't be afraid to get a thyroid test. These are important steps to help you learn about your health, start treatment early if necessary, and stay healthy. If you have any other questions, be sure to talk to your doctor.
` Thyroid, thyroid tests, TSH, T3, T4, hypothyroidism, hyperthyroidism, thyroid hormones, blood tests, thyroid scan
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