Serum Electrolyte Panel with Sodium, Potassium, Chloride, Bicarbonate, and Calcium

What This Test Measures

Your blood sample is analyzed for five critical electrolytes and related compounds: sodium (Na⁺), potassium (K⁺), chloride (Cl⁻), bicarbonate (HCO₃⁻), and calcium (Ca²⁺). These substances help regulate fluid balance, nerve function, muscle contractions, and bone health.

Why It Matters in Your Body

Electrolytes like sodium and potassium work together to maintain proper fluid distribution, nerve signaling, and muscle function. Bicarbonate helps regulate blood acidity, while calcium supports bone strength and muscle activity. Imbalances can lead to symptoms like fatigue, irregular heartbeat, or muscle cramps.

Common Reasons for Testing

Your doctor may order this test if you have symptoms like excessive thirst, swelling, muscle weakness, confusion, or frequent urination. It’s also used to monitor conditions like heart disease, kidney problems, or metabolic disorders.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm, typically in the morning on an empty stomach. The sample is processed to separate serum (the liquid part) for testing. No special preparation is needed beyond avoiding alcohol or certain medications for 24 hours before testing.