How do they diagnose hypothyroidism

Tell your family members. Because thyroid disease runs in families, you should explain your hypothyroidism to your relatives and encourage them to get periodic TSH tests. Tell your other doctors and your pharmacist about your hypothyroidism and the drug and dose with which it is being treated. If you start seeing a new doctor, tell the doctor that you have hypothyroidism and you need your TSH tested every year.

If you are seeing an endocrinologist, ask that copies of your reports be sent to your primary care doctor. There is no cure for hypothyroidism, and most patients have it for life. There are exceptions: many patients with viral thyroiditis have their thyroid function return to normal, as do some patients with thyroiditis after pregnancy. Hypothyroidism may become more or less severe, and your dose of thyroxine may need to change over time. You have to make a lifetime commitment to treatment.

But if you take your pills every day and work with your doctor to get and keep your thyroxine dose right, you should be able to keep your hypothyroidism well controlled throughout your life.

Your symptoms should disappear and the serious effects of low thyroid hormone should improve. If you keep your hypothyroidism well-controlled, it will not shorten your life span. Here are the major causes, from the most to the least common. But in almost every patient, hypothyroidism can be completely controlled. It is treated by replacing the amount of hormone that your own thyroid can no longer make, to bring your T4 and TSH levels back to normal levels. Synthetic thyroxine pills contain hormone exactly like the T4 that the thyroid gland itself makes.

All hypothyroid patients except those with severe myxedema life-threatening hypothyroidism can be treated as outpatients, not having to be admitted to the hospital. The only dangers of thyroxine are caused by taking too little or too much. If you take too little, your hypothyroidism will continue. The most common symptoms of too much thyroid hormone are fatigue but inability to sleep, greater appetite, nervousness, shakiness, feeling hot when other people are cold, and trouble exercising because of weak muscles, shortness of breath , and a racing, skipping heart.

Patients who have hyperthyroid symptoms at any time during thyroxine replacement therapy should have their TSH tested. If it is low, indicating too much thyroid hormone, their dose needs to be lowered. The goal of treatment is to get and keep your TSH in the normal range. Babies with hypothyroidism must get all their daily treatments and have their TSH levels checked as they grow, to prevent mental retardation and stunted growth.

Hypothyroidism Brochure PDF. El folleto de Hipotiroidismo. For information on thyroid patient support organizations, please visit the Patient Support Links section on the ATA website at www. 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. A high level of TSH and a low level of T4 in the blood could mean you have an underactive thyroid. If your test results show raised TSH but normal T4, you may be at risk of developing an underactive thyroid in the future. The GP may recommend that you have a repeat blood test every so often to see whether you eventually develop an underactive thyroid.

Blood tests are also sometimes used for other measurements, such as checking the level of a hormone called triiodothyronine T3. Two common antibodies are thyroid peroxidase antibody and thyroglobulin antibody. Measuring levels of thyroid antibodies may help diagnose the cause of the thyroid problem.

While detecting antibodies is helpful in the initial diagnosis of hypothyroidism due to autoimmune thyroiditis, following their levels over time is not helpful in detecting the development of hypothyroidism or response to therapy.

TSH and FT4 are what tell us about the actual thyroid function or levels. A different antibody that may be positive in a patient with hyperthyroidism is the stimulatory TSH receptor antibody TSI. It is not a measure of thyroid function and it does not diagnose thyroid cancer when the thyroid gland is still present. It is used most often in patients who have had surgery for thyroid cancer in order to monitor them after treatment.

Tg is included in this brochure of thyroid function tests to communicate that, although measured frequently in certain scenarios and individuals, Tg is not a primary measure of thyroid hormone function. The thyroid has developed a very active mechanism for doing this. Therefore, this activity can be measured by having an individual swallow a small amount of iodine, which is radioactive. The radioactivity allows the doctor to track where the iodine goes.

By measuring the amount of radioactivity that is taken up by the thyroid gland radioactive iodine uptake, RAIU , doctors may determine whether the gland is functioning normally. A very high RAIU is seen in individuals whose thyroid gland is overactive hyperthyroidism , while a low RAIU is seen when the thyroid gland is underactive hypothyroidism.

In addition to the radioactive iodine uptake, a thyroid scan may be obtained, which shows a picture of the thyroid gland and reveals what parts of the thyroid have taken up the iodine see Thyroid Nodules brochure.

There are many medications that can affect thyroid function testing. Some common examples include:. For information on thyroid patient support organizations, please visit the Patient Support Links section on the ATA website at www.

Thyroid Function Tests. TESTS Blood tests to measure these hormones are readily available and widely used, but not all are useful in all situations.