Checking electrolytes after having bile duct stone surgery is mainly done through blood tests. If you have already had choledocholithiasis surgery and want to check your electrolytes, you need to go to the hospital for a blood test, and then based on the results of the test, you can see whether the sodium, potassium, calcium and magnesium in your body are within the normal range, and if the values are on the high side or on the low side, you can be judged to have electrolyte disorders. Electrolyte screening is relatively simple and involves drawing blood from a vein on the inside of the elbow joint. After the blood is drawn, a cotton swab is used to apply pressure to stop the bleeding, which can be released in about 3~5 minutes, and the test report can be obtained on the same day. If the patient has nausea, vomiting and diarrhea after the bile duct stone surgery, electrolyte testing is usually recommended to rule out electrolyte disorders. However, it is important to know that the test is done on an empty stomach and that the patient should have a regular routine on the first day of the test. If you have any questions about the test, it is advisable to consult your doctor first.