The thyroxine test is also known as the T4 test. A high T4 level implies a thyroid that is hyperactive (hyperthyroidism). Anxiety, unintentional weight loss, tremors, and diarrhea are all symptoms.
The TSH test determines how much thyroid-stimulating hormone is present in your blood. TSH levels should be between 0.4 to 4.0 milli-international units of hormone per liter of blood (mIU/L) in a normal test.
If you have hypothyroidism symptoms and a TSH of more than 2.0 mIU/L, you’re at risk of developing hypothyroidism. Weight gain, weariness, sadness, and brittle hair and fingernails are among the symptoms. Thyroid function testing will most likely be performed every other year in the future. Your doctor may decide to start treating you with drugs like levothyroxine to relieve your symptoms.
The T3 test measures the amount of the hormone triiodothyronine in the body. If T4 and TSH tests indicate hyperthyroidism, it’s frequently ordered. If you have symptoms of an overactive thyroid gland but your T4 and TSH levels aren’t abnormal, a T3 test may be suggested.
T3 levels should be between 100 and 200 nanograms per deciliter of blood (ng/dL). Grave’s disease is most usually associated with abnormally high levels. This is an autoimmune condition that is linked to hyperthyroidism.