In uroabdomen–associated hyperkalemia, potassium moves ______.

• A. Extracellularly
• B. Intracellularly
• C. Intercellular fluid
• D. Within the bladder

Answer: (A)

In uroabdomen, urine leaks into the peritoneal cavity and contains a high potassium concentration. Across the peritoneal membrane, potassium diffuses from this peritoneal fluid into the systemic circulation, raising the extracellular fluid (serum) potassium level. So the movement is into the extracellular compartment, not into cells or remaining in the bladder.