Blood potassium 3.38mmol/L, need to supplement potassium, blood potassium 3.38mmol/L, lower than the low limit of normal human blood potassium 3.5mmol/L, for this kind of people, you can consider supplementing potassium, the specific ways are as follows: 1, you can eat to supplement potassium, eat more food containing more potassium, such as bananas, oranges, oranges, nuts, etc. 2, you can consider oral potassium tablets to treat, such as Potassium chloride extended-release tablets and potassium citrate granules, etc. for treatment. After potassium supplementation, the blood potassium should be rechecked, and if it returns to normal, the above drugs can be stopped.