Causes of small, flattened or inverted T waves are numerous and include ISCHEMIA (blocked or partially blocked arteries), age, race, hyperventilation, anxiety, drinking iced water, LVH, drugs (e.g.
digoxin), pericarditis, PE, intraventricular conduction delay (e.g. RBBB)and
electrolyte disturbance.
Abnormal T waves has many causes and your post indicates ischemia as the cause. Any EKG test requires other evidence to make a diagnosis.