It is drawn to assess thyroid function. Show More. It is seen in two to three percent of the entire population. The T4 blood test can also be used to monitor the effectiveness of medications used to treat thyroid disease.
This information is about testing and procedures and may include instructions specific to Cleveland Clinic.
Thyroid antibodies are present if hypothyroid is related to thyroiditis. Abnormal thyroid function is common.
Thyroid function tests help to determine if your thyroid is not working correctly:. Thyroid function tests help to determine if your thyroid is not working correctly: Estrogen, anticonvulsants, aspirin use and anticoagulants may affect T4 levels.
The brain regulates the amount of thyroid hormones in the blood. Normal range for an adult: It also can be related to other health problems, such as glucocorticoid or amiodarone use, osteoporosis, pregnancy, insulin dependent diabetes and liver disease.
TSH is a very good test to check for hypothyroidism. When the thyroid is not working properly, it can cause changes in other blood tests as well.
Please consult your physician for information pertaining to your testing. They are increased with pregnancy.
Values may be lowered with use of aspirin, corticosteroids and heparin therapy. Advertising on our site helps support our mission.
High T4 is seen with hyperthyroidism. Values may be raised with use of lithium, potassium, iodide and TSH injections. One of the hormones, thyroxine, is responsible for your metabolism.
The thyroid is a gland located in the neck.