Fig. 2From: Reverse pseudohyperkalemia in a newly diagnosed pediatric patient with acute T-cell leukemia and hyperleukocytosis: a case report and literature reviewSummary of how to differentiate between hyperkalemia, pseudohyperkalemia, and reverse pseudohyperkalemia with selected possible causes. Blood plasma potassium level (blood sample with coagulation), blood serum potassium level (blood sample with no coagulation), whole blood (arterial or venous) blood gas sample with no coagulation and direct analysis without pneumatic transport or centrifugation. Normally, serum K > plasma K by 0.36 ± 0.18 mmol/LBack to article page