Potassium deficiency of 3.04 refers to a serum potassium concentration of 3.04 mmol/L, which belongs to mild potassium deficiency and is relatively not very serious, but also requires timely potassium supplementation. Patients need to consult the doctor in time to identify the cause of low potassium for further treatment. According to the serum potassium concentration, it is usually categorized into mild, moderate and severe potassium deficiency. Serum potassium concentrations between 3 and 3.5 mmol/L are classified as mild potassium deficiency, concentrations between 2.5 and 3 mmol/L are classified as moderate potassium deficiency, and concentrations <2.5 mmol/L are classified as severe potassium deficiency. A serum potassium concentration of 3.04 mmol/L is considered mild potassium deficiency, and symptoms such as fatigue, muscle weakness, abdominal distension, and cardiac arrhythmia may occur. Mild potassium deficiency is not dangerous and can be treated with potassium supplementation by taking potassium chloride delayed-release tablets, potassium citrate granules and other medications under the guidance of a doctor. When symptoms of potassium deficiency appear, you should go to regular hospitals for examination to find out the cause and treatment in time to avoid delaying the condition.