1) Thyroid Stimulating Hormone (TSH) : \n This test is done to screen for and diagnose thyroid disorders. It is done if you have symptoms of hyperthyroidism like weight loss, nervousness, tremors or hypothyroidism like weight gain, constipation, fatigue, cold intolerance. \n 2) Thyroxine Total (T4) :\n A thyroxine test helps diagnose disorders of the thyroid. Thyroxine, also known as T4, is a type of thyroid hormone. This test measures the level of T4 in your blood. Too much or too little T4 can indicate thyroid disease. \n 3) Triiodothyronine Total (T3) : \n The Triiodothyronine test is performed to detect and diagnose disorders of the thyroid gland including hypothyroidism and to evaluate the effectiveness of the treatment.