Serum Electrolyte Panel (with Sodium, Potassium, Chloride, Bicarbonate, Calcium, Magnesium)

What This Test Measures

Your blood contains important minerals like sodium, potassium, chloride, bicarbonate, calcium, and magnesium. These electrolytes help regulate fluid balance, nerve function, muscle contractions, and acid-base balance in your body. This panel checks levels of sodium, potassium, chloride, bicarbonate, calcium, and magnesium, which are critical for overall health and can signal issues if too high or too low.

Why It’s Done

Doctors order this test to diagnose or monitor conditions such as dehydration, heart problems, kidney disease, metabolic disorders, or electrolyte imbalances. It’s also used before surgeries, during pregnancy, or if you have symptoms like unusual thirst, fatigue, muscle weakness, or irregular heartbeat.

Common Conditions Monitored

High or low levels of electrolytes can cause serious problems. For example, low sodium (hyponatremia) may lead to confusion or seizures, while high potassium (hyperkalemia) can affect heart rhythm. Bicarbonate levels help assess acid-base balance, and calcium/magnesium imbalances may indicate bone or nerve issues.

Sample Preparation

You’ll have a small needle inserted into your arm to draw blood. The sample is processed into serum (blood without clotting factors) for testing. Avoid eating or drinking for 8–12 hours before the test if instructed, as food can affect electrolyte levels.