Pseudohyperkalemia in chronic lymphocytic leukemia

Pseudohyperkalemia refers to an elevated in vitro potassium level, but without in vivo hyperkalemia.[1][1] Of 991 patients with CLL and a leukocyte count of 50 × 109/L or higher, 12% had at least 1 instance of pseudohyperkalemia.[2][2] In a study of 49 patients with CLL and pseudohyperkalemia, the