The facts about thyroid testing have a wide and dynamic range but all can be managed through a group of blood tests that are formulated to depend on each other. The thyroid is a gland located in the neck. The job of the thyroid is to take iodine from the blood and combine it with an amino acid (one of the building blocks of protein) to form thyroid hormones. One of the hormones, thyroxine, is responsible for your metabolism. Thyroid blood testing for proper function helps to determine if your thyroid is not working correctly:
When thyroid blood testing, one could be managing a hyperthyroid condition. A hyper thyroid is known as an over active thyroid. On the other end of the spectrum an under active thyroid is considered a hypothyroid which also can be managed through Thyroid blood testing.
When thyroid blood testing is needed, the most commonly ordered test is the Thyroid Stimulating Hormone also known as TSH. TSH is produced by the pituitary gland. It stimulates the production and release of T4 and T3 by the thyroid gland. When TSH concentrations are high, the thyroid will make and release excessive amounts of T4 and T3 and the patient may experience hyperthyroidism, with symptoms such as rapid heart rate, weight loss, nervousness, hand tremors, irritated eyes, and difficulty sleeping.
With decreased production of thyroid hormones (hypothyroidism), the patient can experience symptoms such as weight gain, dry skin, constipation, cold intolerance, and fatigue. Its concentration is measured by means of analysis of a blood sample drawn from the vein in the arm. It’s important to know that consumers can utilize direct to consumer testing by ordering thyroid testing through various online websites that offer this service.
When analyzing thyroid blood testing we can use the TSH test to summarize the management of thyroid health. One would measure TSH in blood in order to diagnose thyroid disorders and to monitor treatment of hypothyroidism and hyperthyroidism.
The TSH test is often chosen for evaluating thyroid function and/or symptoms of hyper- or hypothyroidism.
TSH testing helps in :
• diagnose a thyroid disorder in a person with symptoms
• screen newborns for an underactive thyroid
• monitor thyroid replacement therapy in people with hypothyroidism
• diagnose and monitor female infertility problems
• help evaluate the function of the pituitary gland
• screen adults for thyroid disorders
Reference range values
0.40 – 4.00 mU/L
We mentioned earlier that when managing a thyroid condition, there are other thyroid tests that are helpful. The Tri-iodothyronine (T3) blood test is important to have as well as the Thyroxine (T4) blood test. When utilizing thyroid blood testing techniques, understanding the relationship between TSH, T3 and T4 will help you manage your thyroid health. Here are 5 rules to understand when monitoring thyroid blood testing levels.
When thyroid blood testing, if after a TSH test result is high and a T4 test result is normal, a T3 test result is normal, it can indicate a mild form of hypothyroidism.
If after a TSH test result is high and a T4 test result is low, a T3 test result is normal or low, it can indicate hypothyroidism.
If after a TSH test result low and a T4 test result is normal, a T3 test result is normal, it can indicate a mild form of hyperthyroidism.
If after a TSH test result is low and a T4 test result is normal or high, a T3 test result is normal or high, it can indicate hyperthyroidism.
If after a TSH test result is low and a T4 test result is normal or low, a T3 test result is normal or low, it can indicate a non-thyroidal illness, for example a rare pituitary hypothyroidism.
You can order any of these tests from us from the comfort of your home and with a lab blood draw center within 10 miles of your home. Join what millions of other American’s are doing by taking advantage of online lab testing direct to consumers.