Would a 3-lead ecg, show the t-wave different if potassium was low enough?

Hypokalemia ECG: With significant hypokalemia (potassium less than 3) the ECG will change. T-waves will flatten, u-waves will appear , ECG intervals will increase. While a 12-lead ECG will show these best a three lead (holter monitor) or even a single lead ECG may be enough to show the changes. In general you do not want to wait for ECG changes if you suspect low potassium get a chem 7 bloodtest.

Not your Heart: Why is your physician allowing you to obsess about your heart when this is not your heart. You do not have heart disease at age 22. Please respond to this answer with a question where you honestly include all of your symptoms and your mental health history. In a young male these symptoms almost universally represent stress reactions to chronic anxiety.