Electrolyte and Renal Function Panel (with 24-Hour Urine Collection for Creatinine)

What Your Blood Tests Show

Blood tests assess your electrolyte levels (like sodium, potassium, and chloride) and kidney function markers (such as creatinine and blood urea nitrogen). These help determine if your body is retaining too much fluid, losing important minerals, or struggling to filter waste properly. Your doctor may also check for signs of kidney disease or other health issues.

Why a 24-Hour Urine Sample for Creatinine?

A 24-hour urine sample for creatinine helps measure how well your kidneys are filtering waste over a full day. This provides a more accurate picture than a single blood test, as it reflects your kidney function consistently. It’s especially useful if your doctor suspects kidney disease or needs to monitor how your kidneys are handling waste removal.

Common Conditions This Test Helps Diagnose

This test can help identify problems like chronic kidney disease, fluid imbalances, electrolyte disorders, or kidney damage from conditions like diabetes or high blood pressure. It may also be used to monitor how well dialysis is working if you’re on this treatment.

What to Expect Before the Test

For the blood tests, you’ll typically have a few small tubes drawn from your arm. For the 24-hour urine sample, you’ll collect all urine for a full day, starting after you wake up and ending just before you wake up the next morning. Drink plenty of water but avoid certain medications or foods that might affect the results.