Pseudohyperkalemia and Electrolyte Management in Hematologic Conditions

Pseudohyperkalemia is an artefactual elevation of potassium concentration that emerges when cellular disruption or handling artefacts lead to spurious release of intracellular potassium. In patients with haematological disorders, particularly those with extreme thrombocytosis or leucocytosis, fragile blood elements may lyse during phlebotomy, transport or centrifugation, producing misleading test results. Distinguishing pseudohyperkalaemia from true hyperkalaemia is critical to avoid unwarranted interventions that carry their own risks, notably hypokalaemia. The phenomenon also extends to reverse pseudohyperkalaemia, in which selective leakage or uptake of potassium yields discordant serum and plasma values. Robust pre-analytical protocols, including point-of-care testing and whole-blood assays, alongside clinical correlation and electrocardiographic monitoring, underpin rational electrolyte management. As novel potassium-binding agents enter practice, heightened awareness of spurious laboratory artefacts is essential to prevent iatrogenic harm. Advances in understanding cellular fragility, sample processing and clinical decision pathways have global implications for patient safety, treatment guidelines and laboratory standards in haematology and nephrology practices.

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Pseudohyperkalemia and Electrolyte Management in Hematologic Conditions publication trend

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Technical terms

Pseudohyperkalaemia: Artefactual increase in measured potassium concentration due to in vitro cell lysis or sample handling.

Reverse pseudohyperkalaemia: Discrepancy in potassium measurements stemming from selective cell membrane leakage or ionic shifts producing higher plasma than serum levels.

Thrombocytosis: Elevated platelet count often associated with increased risk of artefactual potassium release in vitro.

Leucocytosis: Raised white blood cell count that may enhance cellular fragility and spuriously elevate potassium results.

Point-of-care testing: Laboratory analysis performed at the bedside to minimise pre-analytical error and improve correlation with clinical status.

References

1. Pseudohyperkalemia - Potassium released from cells due to clotting and centrifugation - a case report. Biochemia Medica (2017).
2. Reverse Pseudohyperkalemia: An Important Clinical Entity in Chronic Lymphocytic Leukemia. Case Reports in Hematology (2015).
3. Pseudohyperkalemia and the Need for Imperative Caution With the Newly Introduced Potent Potassium Binders: Two Cases. Cureus (2021).
4. Pseudohyperkalemia in chronic lymphocytic leukemia and diabetic ketoacidosis. Clinical Case Reports (2023).