All Thyroid Tests

Thyroid Testing and health information

Ulta Lab Tests provides the ten key lab tests to diagnose, monitor, and manage hypothyroidism and hyperthyroidism. 

Two primary conditions may require a thyroid test: hypothyroidism and hyperthyroidism. Hypothyroidism encompasses conditions in which your thyroid isn't producing enough T3 and T4. Hyperthyroidism is the term for conditions where your body produces too much thyroid hormone.  

Hypothyroidism, a condition when your thyroid isn't making enough hormone, may be caused by Hashimoto's thyroiditis, secondary hypothyroidism (a failure of the pituitary gland), or some inflammatory conditions. You may notice ... See more


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This article will cover the thyroid biomarkers. This will include the thyroid-stimulating hormone, also known as TSH. We’re also going to look at T3 and T4, both free and total in each case. We’ll also cover reverse T3 and investigate a new ratio, being the free/reverse T3 ratio. Also, we’re going to look at a few older markers, too, including the free thyroid index called T7. Then, we’ll move on to T3 uptake and move on to two of the most essential antibodies. Finally, we’ll investigate antithyroglobulin antibodies, thyroid peroxidase, and anti-TPO. 

In terms of TSH, it’s useful for many different reasons. First, we can use it for both the determination of hypothyroidism as well as the potential differentiation of it. It’s also effective for both hyperactive thyroid and the ... See more

TSH (Thyroid-Stimulating Hormone)

Test: TSH (Thyroid-stimulating Hormone)

Why have this test? 

This Thyroid-Stimulating Hormone is used to check for and diagnose disorders of the thyroid. It is also used to monitor the ongoing treatment of both hyperthyroidism and hypothyroidism.

When Should You be Tested?

Screening is commonly recommended for newborns. There is no medical consensus as to the adult age for screening or whether adult screening should be standard.

Treatment monitoring: As recommended by your medical provider

Other Situations:  If an individual has an enlarged thyroid and/or has experienced the symptoms of hypothyroidism or hyperthyroidism.

Required Sample Type: A sample of blood taken from a vein in the arm, or for infants, from pricking the heel.

Preparation for the Test: There is ... See more

The thyroid is located at the base of the neck. It is a small, butterfly-shaped gland that produces thyroid hormones such as thyroxine or T4 and triiodothyronine or T3.  These hormones are required for the regulation of the metabolism as they tell your cells how fast to use energy and produce protein.  This gland is also responsible to produce calcitonin, which is the hormone that regulates calcium levels in the blood by preventing the breakdown of bone.  It also increases the elimination of calcium from the kidneys.  To control the amounts of T3 and T4, the body has an elaborate feedback system.  

When there is a decrease in the hormones in the blood, the hypothalamus will release thyrotropin-releasing hormones.  These tell the pituitary gland to start releasing the thyroid-stimulating hormone TSH.  The thyroid gland will then start to produce and release T4 and T3.   

As the thyroid ... See more