Serum/plasma sodium and potassium concentration profile (24-hour profile)

Why This Test Is Done

Your doctor may order this test if you have symptoms like unusual thirst, swelling, muscle weakness, confusion, or irregular heartbeat. It’s also used to monitor kidney function, heart health, or conditions like hypertension or kidney disease.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications or foods for a short time. Drink plenty of water unless instructed otherwise, as it helps your body’s natural electrolyte balance.

What the Test Involves

A healthcare provider will draw blood from a vein in your arm. You may feel a small pinch, but it usually takes only a few minutes. If you’re taking a 24-hour urine test for electrolytes, you’ll collect urine in a special container over 24 hours.

What the Results Mean

Your results will show how much sodium and potassium are in your blood or urine over time. Abnormal levels can indicate problems with kidney function, heart rhythm, or fluid balance, but exact values aren’t provided here—your doctor will interpret them with your symptoms and medical history.