Wednesday, June 15, 2022
HomeExclusiveWhat Blood Test Checks Your Thyroid

What Blood Test Checks Your Thyroid

What About Thyroid Medications For Subclinical Hypothyroidism

How To Order Your Own Thyroid Blood Tests

Starting thyroid medication in subclinical hypothyroidism is considered controversial by endocrine groups. Exceptions are made for women who are contemplating pregnancy and for those who have overt hypothyroid symptoms. Guidelines clearly state that in order to avoid pregnancy complications and impaired development of offspring, women with subclinical hypothyroidism need to be treated with thyroid hormones.

At this stage, many patients may also opt to wait and see and may forgo thyroid medications in an effort to do it naturally. I know that I was one of those people, and I waited six months to get on medications after my diagnosis, but knowing what I know now, I am in favor of starting medications for subclinical hypothyroidism.

Why?

Korzeniowska and colleagues at the Medical University of Gdansk found that treating children with subclinical hypothyroidism with thyroid hormones, resulted in a decrease of inflammation. This means that the medications gave their thyroids a rest and resulted in a slowing down of the autoimmune attack, manifested by lower levels of thyroid antibodies.

Additionally, most patients with subclinical hypothyroidism feel so much better when they start on thyroid hormones.

I wanted to believe that these interventions were keeping me from getting worse until my husband and I took a red-eye flight from Los Angeles to visit friends on the East Coast in the winter. The lack of sleep combined with the cold weather put me in a hypothyroid flare.

How To Check Your Thyroid

This article was medically reviewed by Ricardo Correa, MD. Dr. Correa is a board certified Endocrinologist. Dr. Correa is the Program Director of the Endocrinology, Diabetes and Metabolism Fellowship at the University of Arizona College of Medicine and was a previous Assistant Professor of Medicine at Brown University. He completed his MD at the University of Panama and completed an internal medicine residency at the Jackson Memorial Hospital – University of Miami. He has been voted one of the 40 Under 40 Leaders in Health by the National Minority Quality Forum in 2019.There are 12 references cited in this article, which can be found at the bottom of the page. This article has been viewed 40,747 times.

The thyroid gland is located at the base of your neck. It is a very important gland that produces a hormone that helps regulate your entire bodys metabolism, temperature, heart rate, growth, and development.XResearch source The thyroid gland can be functionally underactive or overactive. The thyroid can be enlarged, have benign nodules and, more rarely, malignant nodules.

What Blood Tests Do Doctors Use To Check Thyroid Function

Doctors may order one or more blood tests to check your thyroid function. Tests may include thyroid stimulating hormone , T4, T3, and thyroid antibody tests.

For these tests, a health care professional will draw blood from your arm and send it to a lab for testing. Your doctor will talk to you about your test results.

Don’t Miss: Can I Take Thyroid Medication With Apple Cider Vinegar

What Are Thyroid Function Tests

If your doctor suspects you are having problems with your thyroid, he or she may recommend a thyroid function test.

These simple blood tests are used to determine how well your thyroid gland is working based on your hormone levels.

There are four different types of thyroid function tests: T3, T3RU, T4 and TSH.

If your doctor is concerned about the levels of your hormones, broad screening tests, like the T4 or the TSH test will be ordered.

Further tests may be needed to help determine whats going on if the results of these tests come back abnormal.

How Often Should I Take A Thyroid Test

A Look At Hypothyroidism (Underactive Thyroid)

How often you take a thyroid test will depend on your diagnosis and symptoms.

If you are monitoring your thyroid function, you should always take the test at the same time of day so that you can compare results properly. We recommend taking your thyroid function test in the morning before you have taken any thyroid medication.

Wondering what some of these thyroid-related terms mean? Our thyroid glossary explains every thyroid-related medical term in a way that makes sense.

Recommended Reading: Can Hypothyroidism Cause Eye Floaters

Who Should Perform Neck Checks

Theres no definitive recommendation for when to begin performing self-exams, but Mechanick does note that the cancer can appear in young adulthood. It also rarely develops in childhood or adolescence.

Every person when they have their general physical should have a thyroid exam, and then people who are at higher risk should potentially have a thyroid ultrasoundand not rely just on the manual exam, Mechanick said. By doing this you can detect thyroid cancer at the very early stages.

What Does Your Tsh Really Mean

Many physicians consider TSH to be the most accurate marker of thyroid status in your body.

With that in mind, it makes sense to talk about what it actually does in your body.

TSH stands for thyroid stimulating hormone and it is a hormone secreted by your pituitary gland.

Thyroid physiology is quite complex but we can break it down to an easy to understand sequence:

Your hypothalamus pumps out a hormone called TRH .

TRH then acts on your pituitary gland to stimulate the release of TSH .

TSH then enters your bloodstream and lands on receptors directly on your thyroid gland which then causes the release of thyroid hormones T3 and T4.

T3 and T4 then enter the bloodstream and target specific cells in the body to alter genetic transcription, increase energy production and so forth.

This complex system is regulated at several steps and one step that we use to assess the stability of this entire system is the serum concentration of TSH.

This isnt the best marker of thyroid function by itself, but it can give you a quick idea of what is happening in the body.

So what does a high TSH actually mean?

An elevation in TSH is an indicator that the system is not working properly, and in this case, it means that thyroid function in the serum is low.

Low levels of T3 and T4 circulate back up to the pituitary gland which tells the body that not enough thyroid hormone is being produced.

Hopefully, this is making sense.

The exact opposite is true when the TSH is low.

You May Like: Np Thyroid Inactive Ingredients

What To Consider In Your Personal And Family Medical Histories

Its important to give your physician as many details as possible about your personal medical history, as well as family history . Be sure to discuss:

  • Your general state of healthparticularly any changes you have noticed in your general overall health.
  • Your familys health historyespecially if a close relative has been diagnosed with hypothyroidism .
  • Whether youve ever had thyroid surgery, or radiation to your neck to treat cancer.
  • Any medicines you may be taking that could cause hypothyroidism .

Physical ExaminationLooking for Signs of HypothyroidismYour physician will perform a thorough examination and look for physical signs of hypothyroidism, including:

  • Evidence of dry skin
  • Swelling around the eyes and legs
  • Slower reflexes
  • Slower heart rate

Blood Tests: Hypothyroidism can be detected by different blood tests.

  • TSH Test. A thyroid-stimulating hormone or TSH is a blood test that measures the amount of T4 that the thyroid is being signaled to make. If you have an abnormally high level of TSH, it could mean you have hypothyroidism.
  • T4 Test. The thyroid gland produces T4 . The free T4 and the free T4 index are blood tests that, in combination with a TSH test, can let your physician know how your thyroid is functioning.

Normal and Abnormal TSH Ranges

An easy way to remember how the thyroid works–think about supply and demand. As the T4 level falls, the TSH rises. As the T4 level rises, the TSH falls. However, not everyone with hypothyroidism has elevated levels of TSH.

What Are The Types Of Thyroid Disorders

No One Tested Your Thyroid Completely I Blood Test For Thyroid I Nutrition Expert Palak

    Blood tests are used to diagnose hypothyroidism or hyperthyroidism. They do not point to a specific cause. In order to determine a cause of the thyroid abnormality, the doctor will consider the patient’s history, physical examination, and medical condition. Further testing might be used to isolate an underlying cause. These tests might include more blood testing for

    • thyroid antibodies,
    • ultrasound of the thyroid gland, or
    • others.

    If thyroid cancer is suspected and surgery may be required, your physician may ask for a blood test known as thyroglobulin.

    • Thyroglobulin is a protein made only by thyroid cells.
    • If the thyroglobulin level at baseline is detectable or elevated it can be used as a tumor marker.
    • After a total thyroidectomy for cancer the level should fall to an undetectable range since the cells that make thyroglobulin have been removed.
    • If the level remains detectable after surgery, there is a possibility of thyroid tissue elsewhere in the body, and metastatic disease should be considered.
    • If the level is undetectable for a period of time after surgery and then starts to climb, a recurrence of the cancer – either at the primary site or elsewhere in the body should be considered.

    Recommended Reading: What Does Atrophic Thyroid Gland Mean

    What Do My Thyroid Test Results Mean

    The two most common types of thyroid function tests are the T4 and TSH test. Typically, these two tests are ordered together.

    The T4 testmore commonly known as the thyroxine testis used to determine if your thyroid is overactive. If this is the case, you will be diagnosed with hyperthyroidism.

    Symptoms of hyperthyroidism include unplanned weight loss, tremors, diarrhea and anxiety.

    The TSH test will reveal how much thyroid-stimulating hormone is in your blood. Normal levels range from 0.4 to 4.0 milli-international units of hormone per liter of blood.

    If youve been diagnosed with hyperthyroidism and your TSH levels are above 2.0 mIU/L, you are at a heightened risk of developing hypothyroidism, which can result in weight gain, fatigue, depression and weak hair and nails.

    If your doctor believes you have hyperthyroidism, he or she may order a T3 test to check for levels of the hormone triiodothyronine.

    This hormone level should be within 100-200 nanograms of hormone per deciliter of blood. If your levels are abnormally high, it is possible that you are suffering from an autoimmune disorder called Graves disease.

    The final thyroid function test your doctor may order is the T3 resin uptake test. Also known as a T3RU, this blood test will measure the binding capacity of a hormone called thyroxin-binding globulin.

    Your doctors office should reach out to you within a matter of days to walk you through the results of your thyroid test.

    Computed Tomography Scan For Medullary Thyroid Cancer

    The CT scan of the neck for medullary thyroid cancer is an x-ray test that produces detailed cross-sectional images of your body from the bottom of your brain to the middle of your chest. It can help determine the location and size of the medullary thyroid cancer, whether the cancer has invaded into any nearby structures, and whether they have spread to lymph nodes in nearby areas. A CT scan can also be used to look for spread into distant organs such as the lungs.

    A CT scanner has been described as a large donut, with a narrow table in the middle opening. You will need to lie still on the table while the scan is being done. CT scans take longer than regular x-rays, and you might feel a bit confined by the ring while the pictures are being taken.

    Instead of taking one picture, like a regular x-ray, a CT scanner takes many pictures while you lie on the table. A computer then combines these pictures into images of slices of the part of your body being studied. A CT scan designed for a diagnosis of papillary thyroid cancer is sliced at 1mm steps. It is an incredibly detailed study that creates very exquisite images.

    This is a CT scan of the neck in a patient with a small medullary thyroid cancer of the right thyroid lobe. The dashed arrow points to a small lymph node in the right mid neck.

    You May Like: Is Apple Cider Vinegar Good For Your Thyroid

    What Should I Do To Prepare For A Thyroid Function Test

    Thyroid function tests usually require very little preparation.

    You don’t need to fast before the blood test. And it doesn’t matter if you have taken your thyroid medicine just before the blood test.

    Tell your doctor if you are taking any medication, as some medicines can alter the test results and how they are interpreted.

    It is also important to mention if you have had any X-ray tests that have used a special contrast dye, as this may contain iodine which can affect the results. Levels of thyroid chemicals also change in pregnancy, so tell your doctor if you are pregnant when the test is taken.

    Note: all newborn children have their thyroid function tested as part of the heel prick test which is offered to all babies and undertaken when they are 5 days old. See the separate leaflet called Newborn Baby Screening Tests for more information.

    What Is The Thyroid Gland

    Thyroid blood test, thyroid function test, normal values ...

    The thyroid gland is a butterfly-shaped endocrine gland that is normally located in the lower front of the neck. The thyroids job is to make thyroid hormones, which are secreted into the blood and then carried to every tissue in the body. Thyroid hormones help the body use energy, stay warm and keep the brain, heart, muscles, and other organs working as they should.

    Also Check: Does Graves Disease Go Away After Thyroid Removed

    What Does Your Thyroid Gland Do

    Your thyroid gland is a gland found at the front of your neck, just below your Adams apple. Your thyroid gland produces hormones that play a key role in regulating your metabolism and affects things like your heart rate, body temperature, and breathing. These hormones are:

    • thyroxine

    The levels of these hormones are controlled by thyrotropin-releasing hormone and thyroid-stimulating hormone .

    What About Those Already On Thyroid Medications

    If youre already on thyroid meds, but still have symptoms, you may need to up your dosage so that your labs fall within the optimal range, which in turn can help you feel better.

    Please take a look at my article on TSH for a letter that you can take to your physician if he/she is not familiar with the current optimal reference range. As I mentioned earlier, I personally feel best with a TSH a bit under 1IU/mL, but you may need some trial and error to find your personal best TSH.

    Once you establish a dose of medication thats working for you and as long as your symptoms dont change you can test your thyroid hormones every six months.

    Don’t Miss: How To Check For Thyroid Issues

    What Does The Test Result Mean

    If the feedback system involving the thyroid gland is not functioning properly due to one of a variety of disorders, then increased or decreased amounts of thyroid hormones may result.

    • When TSH levels are increased, the thyroid will make and release inappropriate amounts of T4 and T3 and you may experience symptoms associated with hyperthyroidism.
    • If there is decreased production of thyroid hormones, you may have symptoms of hypothyroidism.

    The test results alone are not diagnostic but will prompt your healthcare practitioner to perform additional testing to investigate the cause of the excess or deficiency and thyroid disorder. As examples, the most common cause of hyperthyroidism is Graves disease and the most common cause of hypothyroidism is Hashimoto thyroiditis.

    The following table summarizes some examples of typical test results and their potential meaning.

    Note: Laboratory results must always be correlated with the clinical findings of the patient.
    TSH
    Hypothyroidism resulting from a problem with the hypothalamus or pituitary signals that govern the thyroid gland

    The Eight Blood Tests You Need To Assess Thyroid Function

    Thyroid Blood Tests | Thyroid Series | Dr.Ravi Sankar | Endocrinologist | Hi9

    December 6, 2017 by Megan

    You didnt read that wrong. Thats right. I said the EIGHT blood tests for thyroid function assessment that you need to have run.

    Now hold on, you think. My doctor only runs TWO blood tests for thyroid function TSH and T4. What am I missing??

    Six other blood tests. Thats what youre missing.

    Yes, TSH and T4 are important in the big picture of thyroid health, but without the other 6, MANY thyroid conditions often go undiagnosed. So you could be feeling like crap, wondering whats going on because your thyroid is normal according to your doctor.

    Alright, lets get to it. Here are the EIGHT MOST IMPORTANT blood tests you need to have run in order to assess proper thyroid function.

    Don’t Miss: Does Graves Disease Go Away After Thyroid Removed

    Is There Anything Else I Should Know

    In the past, panels of tests were more common. More recently, however, the practice has been to order, where possible, one initial or screening test and then follow up with additional testing, if needed, to reduce the number of unnecessary tests. With thyroid testing, one strategy is to screen with a TSH test and then order additional tests if the results are abnormal or if clinical suspicions warrant.

    Your thyroid hormone test results can be affected by:

    • Increases, decreases, and changes in the proteins that bind T4 and T3
    • Pregnancy

    What Are The Treatments Of Thyroid Disease

    There is no one treatment for thyroid disease. However, as there are different types of it and causes of it, hence your doctors will prescribe you accordingly. One thing to note is that the thyroid disease is incurable however, as hopeless as it sounds, it is manageable, and with a thyroid problem, you can still live your everyday life.

    Before deciding your treatment plan, your doctor will examine your complete condition through different tests and symptoms. Additionally, your age, gender, other health conditions and type of thyroid disease plays a vital role in deciding the treatment plan.

    Different drugs are introduced to balance the substance production of your thyroid glands. With your hypothyroidism, the production will increase, whereas, with hyperthyroidism, the production of hormones will decrease. The diet plans are also suggested by the doctors so that your overall health may not be affected. Exercises and herbal remedies will help manage your symptoms in a better way. Additionally, certain surgeries are also effective in thyroid problems. Your doctor can only determine and suggest to you how to manage your thyroid hormone levels.

    Recommended Reading: Tsh Fasting Or Nonfasting

    RELATED ARTICLES

    Popular Articles