A healthcare provider will collect your blood into a tube or vial and send it to a lab for testing. Typical results for the total T4 test in adults generally range from 5.
Results for children vary based on age. Talk to your doctor about the normal ranges expected for your child. There may also be some variation between labs. Typical results in adults for the free T4 test generally range from 0. Like total T4 in adults, free T4 also varies in children according to age. As with any test result, if it falls outside the expected range, talk to your doctor about what the results may mean in regards to your own personal health condition.
For example, your T4 results could fall into a normal range, but your T3 results could be abnormal. This can be particularly true in cases of an overactive thyroid. You can also order an at-home thyroid test to measure T4 levels. An abnormal result on the T4 test alone may not give your doctor enough information to fully understand or diagnose your condition. They may also need to consider the results of T3 and TSH levels for a more complete picture. Pregnancy can also affect your T4 levels.
Elevated T4 levels may indicate hyperthyroidism. September 20, [Epub ahead of print]. Using this population, the authors were able to include 10, participants who all had thyroid hormone blood tests TSH, FT 4 , who did not have a history of cancer, and who they could follow from to or death to determine if the subject developed a solid cancer.
There were cases of solid cancer over an average follow up time of Based on the complicated statistical methods which included adjusting the statistics for other potential causes or risk factors for developing cancer, they found that there was a significant positive association between FT 4 level and lung cancer and breast cancer, but not for prostate or GI cancers. Hyperthyroidism overactive thyroid occurs when your thyroid gland produces too much of the hormone thyroxine.
Hyperthyroidism can accelerate your body's metabolism, causing unintentional weight loss and a rapid or irregular heartbeat. Several treatments are available for hyperthyroidism.
Doctors use anti-thyroid medications and radioactive iodine to slow the production of thyroid hormones. Sometimes, hyperthyroidism treatment involves surgery to remove all or part of your thyroid gland. Although hyperthyroidism can be serious if you ignore it, most people respond well once hyperthyroidism is diagnosed and treated. Hyperthyroidism can mimic other health problems, which can make it difficult for your doctor to diagnose. It can also cause a wide variety of signs and symptoms, including:.
Older adults are more likely to have either no signs or symptoms or subtle ones, such as an increased heart rate, heat intolerance and a tendency to become tired during ordinary activities. Sometimes an uncommon problem called Graves' ophthalmopathy may affect your eyes, especially if you smoke. This disorder makes your eyeballs protrude beyond their normal protective orbits when the tissues and muscles behind your eyes swell.
Eye problems often improve without treatment. If you experience unexplained weight loss, a rapid heartbeat, unusual sweating, swelling at the base of your neck or other signs and symptoms associated with hyperthyroidism, see your doctor. It's important to completely describe the changes you've observed, because many signs and symptoms of hyperthyroidism may be associated with a number of other conditions.
If you've been treated for hyperthyroidism or you currently are being treated, see your doctor regularly as advised so that he or she can monitor your condition. It also plays an important role in regulating your weight, body temperature, muscle strength, and even your mood. Thyroxine, also known as T4, is a type of thyroid hormone. This test measures the level of T4 in your blood. Too much or too little T4 can indicate thyroid disease. A test that measures both free and bound T4 is called a total T4 test.
Other tests measure just free T4. A free T4 test is considered more accurate than a total T4 test for checking thyroid function. Other names: free thyroxine, free T4, total T4 concentration, thyroxine screen, free T4 concentration. Thyroid disease is much more common in women and most often occurs under the age of It also tend to run in families. You may need a thyroxine test if a family member has ever had thyroid disease or if you have symptoms of having too much thyroid hormone in your blood, a condition called hyperthyroidism , or symptoms of having too little thyroid hormone, a condition called hypothyroidism.
A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
You don't need any special preparations for a thyroxine blood test.
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