Which hormone is indirectly diagnosed using a T3 test?

The hormone that is indirectly diagnosed using a T3 test is Triiodothyronine. The T3 test measures the levels of this thyroid hormone in the blood. Triiodothyronine is one of the primary hormones produced by the thyroid gland, and it plays a critical role in regulating metabolism, energy levels, and overall hormonal balance.

Though the T3 test specifically measures the levels of Triiodothyronine, it is important for clinicians to consider the balance between T3 and other thyroid hormones, such as Thyroxine (T4). T4 is converted into T3 in the body, and since T3 is the more active form, measuring T3 can provide insights into thyroid function.

In cases of thyroid dysfunction, if T3 levels are abnormal, it can imply an issue with the thyroid gland itself or with its regulation, dealing indirectly with the status of other hormones, such as T4. Therefore, while the T3 test focuses on measuring Triiodothyronine, it also provides indirect information about the overall thyroid function that involves other hormones.