Which test measures electrolytes in the blood?

• A. Esophagogastroduodenoscopy
• B. Esophagoscopy
• C. Fluoroscopy
• D. Electrolyte panel

Answer: (D)

Electrolyte balance in the blood is assessed with an electrolyte panel, a blood chemistry test that reports key ions such as sodium, potassium, chloride, and bicarbonate. This panel directly measures the concentration of these minerals in the bloodstream, helping evaluate hydration, acid-base status, and kidney function. The other options are procedures that visualize or image the body (endoscopy of the esophagus/stomach or fluoroscopy) and do not provide blood electrolyte levels.