*This 68-year-old male smoker presents with fatigue and ptosis?*
*What tests would be appropriate to perform?*
A. erum renin levels
B. Atrial natriuretic peptide
C. Urea breath test
D. Barium meal
E. Injection of edrophonium chloride
F. Colonoscopy
G. Tensilon test
H. Angiotensin Converting Enzyme
I. Chest x-ray
J. VanillylMandelic acid in the urine