Serum or plasma electrolytes and renal function panel (comprehensive)

Why This Test Matters for Dialysis Patients

Patients on chronic dialysis often have kidney function that can’t be fully restored, so this test helps track how well their remaining kidneys (or dialysis) manage essential substances like sodium, potassium, chloride, bicarbonate, creatinine, and urea. It also checks for signs of fluid overload or electrolyte imbalances that could worsen with illness or stress, especially near the end of life.

Common Analytes Measured

This test typically includes measurements for sodium, potassium, chloride, bicarbonate, blood urea nitrogen (BUN), creatinine, and sometimes calcium or phosphate. These values help doctors determine if your body is retaining too much fluid, losing important minerals, or struggling to process waste products.

What to Expect Before the Test

You may have a simple blood draw from a vein in your arm. If you’re on dialysis, your lab technician may use a sample from your dialysis access site. No special preparation is needed unless your doctor specifies otherwise.

When Results Might Be Different

If you’ve recently had dialysis, eaten a high-sodium meal, or are dehydrated or fluid-overloaded, your results might be slightly off from normal. Your doctor will consider your overall health and recent activities when interpreting these results.