Patients with chronic lymphocytic leukemia (CLL), particularly with unstable disease, are prone to severe metabolic complications such as hyperkalemia. Pseudohyperkalemia, or spurious hyperkalemia, has serious clinical consequences such as masking clinically important hypokalemia if serum potassium concentration is normal; this can be prevented with early identification and differentiation from hyperkalemia. However, pseudohyperkalemia is not well recognized in nursing literature. This case report describes the acute development of pseudohyperkalemia in a patient with unstable CLL receiving care at a large academic cancer center.
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