24 Hour Urine Sodium (Na+)

You should get a 24-hour urine sodium test if you have abnormal blood sodium levels, high blood pressure that is difficult to control, or recurrent kidney stones. It is also recommended for evaluating kidney disease, adrenal disorders, heart failure, or fluid imbalance, and for checking dietary salt intake during blood pressure management.

To prepare for a 24-hour urine sodium test, discard your first morning urine and note the time. Then collect all urine for the next 24 hours in the container provided, including the next morning's first sample. Keep the container refrigerated. Follow your usual diet and salt intake unless advised otherwise, and inform your doctor about diuretics or other medicines.

No, fasting is not required for a 24-hour urine sodium test. You should eat your usual diet and salt intake during the collection period unless your doctor advises otherwise, as the test reflects your normal sodium balance. Drink fluids normally, and collect every urine sample over the full 24 hours.