Medical Diagnosis - Hyperthyroidism

Please answer the following medical question: Female, 23 years old. For two months, she has had palpitations, easy sweating, and weight loss of about 3kg. Examination: blood pressure 126/68mmHg, medium build, slightly moist skin, mild fine tremor in both hands, no exophthalmos, thyroid gland I° enlarged, no vascular murmur heard, heart rate 94 beats/min, regular rhythm. To confirm whether it is hyperthyroidism, what examinations should be done and what indicators should be checked?