Serum/plasma electrolytes and renal function panel (comprehensive)

What Does This Test Measure?

This panel typically includes measurements for sodium, potassium, chloride, bicarbonate, creatinine, and sometimes blood urea nitrogen (BUN). Sodium and potassium are vital for nerve and muscle function, while creatinine and BUN help evaluate kidney function. Chloride and bicarbonate support acid-base balance in your blood.

Why Is This Test Important?

Your body relies on precise levels of electrolytes to maintain proper fluid balance, nerve signaling, and kidney function. Abnormal results may indicate dehydration, kidney issues, heart problems, or metabolic imbalances.

Common Reasons for This Test

Doctors may order this test if you have symptoms like excessive thirst, fatigue, muscle weakness, confusion, or signs of kidney problems. It’s also used during routine check-ups, before surgeries, or to monitor chronic conditions like heart disease or diabetes.

Sample Preparation and Timing

For this test, a blood sample is drawn from a vein in your arm. You may be asked to fast for 8–12 hours before the test if creatinine or BUN are included, but electrolytes can often be tested on an empty stomach or anytime. Follow your doctor’s specific instructions.