Final answer:
A potassium level of 3.0 would commonly be associated with the ECG finding of U wave. Low potassium levels can cause changes in the ECG, including the appearance of U waves. These U waves can merge with the T wave, creating a prolonged and flattening T wave on the ECG.
Step-by-step explanation:
A potassium level of 3.0 would commonly be associated with the ECG finding of U wave. The U wave is a small, positive deflection that occurs after the T wave. It represents the repolarization of the Purkinje fibers in the ventricles. Low potassium levels can cause changes in the ECG, including the appearance of U waves. These U waves can merge with the T wave, creating a prolonged and flattening T wave on the ECG.