Your doctor will be focusing on the two hormones that control the metabolism, triiodothyronine (T3) and thyroxine (T4). Results of the TSH test are typically available 2-3 days after the test is given.If your pituitary gland is producing TSH trying to stimulate the thyroid but the thyroid does not respond, it can result in an excessive amount of TSH in the bloodstream. This can be caused by stress, illness, an obstruction or surgery causing the thyroid to malfunction or be sluggish.
The second, a free T4 test, measures only the free T4 in your blood. Why Doctors Perform a T4 Test. Your doctor will often order a T4 if a thyroid-stimulating hormone (TSH) test has come back with abnormal results and your doctor wants further insight into what could be wrong with your thyroid.The body begins to consume calories too quickly and produces an excessive amount of neurotransmitters. Thus, the principal symptoms of too much thyroxine are agitation, weight loss, shakiness, and poor sleep.
A number of circumstances such as surgery, taking psychiatric medications, radiation therapy or an autoimmune disease can lead to this condition. Hypothyroidism is typically managed with medication that will artificially replace these hormones.For example, the levels of T3 in your blood might help shed light on the situation. Elevated T4 levels might indicate: hyperthyroidism, such as iodine-induced hyperthyroidism or Graves disease (an autoimmune disease that causes hyperthyroidism) other thyroid problems, such as thyroiditis (inflammation of the thyroid gland) or toxic multinodular goiter (an enlarged thyroid gland with.
High TSH - High levels of TSH are typically caused by an underactive thyroid or hypothyroidism. This is typically caused by Hashimoto's thyroiditis. If you are already being treated for a thyroid disorder this can be a sign that you need to increase your medication.Some of your T4 is called free T4. This means that it has not bonded to protein in your blood. Most of the T4 in your body does bond with protein.
Some thyroid disorders include: hyperthyroidism (overactive thyroid) hypothyroidism (underactive thyroid) hypopituitarism (underactive pituitary gland) thyrotoxic periodic paralysis (occasional muscle weakness caused by high levels of thyroid hormone) Your doctor might suspect that one of these thyroid conditions is present if you have symptoms such as: eye issues, such as dryness, irritation, puffiness, bulging skin dryness.What Is a T4 Test? Your thyroid produces a hormone, thyroxine, which is known as T4. This hormone plays a role in several of your bodys functions, including growth and metabolism.
Individuals with high thyroxine levels also have excessive perspiration and difficulty tolerating heat because the hormone helps regulate temperature. Patients feel fatigued because their bodies are like engines that are running at too high a speed.In rare cases, you may be showing high TSH levels because you have developed a tumor that is causing the pituitary gland to over-produce TSH. Conditions that Cause High TSH Once it is determined that you have excessive levels of TSH in your system, your doctor will start narrowing down what is causing the trouble.
Other symptoms associated with high levels of thyroxine progressively worsen if the condition does not receive treatment. The heart may experience significant stress, which risks the possibility of dangerous arrythmias, congestive heart failure, and angina.You may need to stop taking certain drugs temporarily before the test to help ensure accurate results. Medications that can affect your T4 levels include: drugs including hormones, such as androgen, estrogen, birth control pills drugs designed to affect your thyroid or treat thyroid conditions some drugs designed to treat cancer steroids.
In some cases an elastic band may be placed around the arm to make it easier to collect the blood. You should not feel a great deal of pain from the elastic band or the needle, though you may develop a bruise at the injection site.If the whole gland most be removed, patients would then require supplementary T4, since having too little thyroxine is just as dangerous as having too much.
There are a range of levels that your TSH levels can be. Learning what these levels mean will help you work with your doctor to address your condition adequately. Normal TSH - Adults should have TSH hormone levels that range from mU/L.Other causes include viruses, and treatment for hypothyroidism where the patient is taking too high a dose of thyroxine. Depending on the cause of high thyroxine levels, treatment might include medications to temporarily reduce T4.
Pituitary Tumors. In rare cases, excessive TSH levels are a sign that your pituitary gland is not functioning properly. In some cases this is because a group of cells has begun to grow on top of the gland.We applaud you for taking an active role in your health! To your health, The Healthline Team Recommended for You.
If you are already being treated for thyroid issues, you may develop low TSH levels if you are taking too much thyroid medication. If you are not showing signs of overactive thyroid you may have damaged the pituitary gland, causing it to produce less TSH.What is a TSH Test? A TSH test is a lab test that analyzes your blood to determine the body's overall TSH levels. If you begin to show signs of a malfunctioning thyroid your doctor my order a test to check for the TSH levels in your system.
An abnormal result on this test alone may not give your doctor enough information to fully understand or diagnose your condition. Pregnancy can affect your T4 levels. If your T4 levels are abnormal but you are pregnant, your doctor may order further testing.More commonly, you may experience pain or discomfort during the blood draw. You might also bleed slightly after the needle is removed, and you might develop a small bruise around the puncture site.