A 44-year-old woman has lost weight over 12 months. She has also had episodes where her heart beats rapidly and strongly. Her family has noticed that she loses her temper easily. She has a regular pulse rate of 90 beats/minute. Her ECG shows sinus rhythm.
A. Thyroid autoantibodies
B. Thyroid function tests
C. 24 hour ambulatory taped electrocardiogram (ECG)
D. Cardiac enzymes
E. Chest X-ray
Ans. The key is B. Thyroid function tests. [Weight loss, palpitations, irritability these are features of hyperthyroidism. So we should go for thyroid function test to demonstrate hyperthyroidism