• E Le Goff, K Jondeau, M-D Venon, S Greffe, E Ronez, S Ngo, J-E Kahn, and T Hanslik.
• Service de médecine interne, hôpital Ambroise-Paré, Assistance publique-Hôpitaux de Paris, 92100 Boulogne-Billancourt, France; UFR Simone Veil-Santé, université Versailles-Saint-Quentin, 78180 Montigny-le-Bretonneux, France. Electronic address: enora.legoffhemato@gmail.com.
• Rev Med Interne. 2021 Jun 1; 42 (6): 438-441.

IntroductionHyperkalemia is common in medicine and requires rapid management. Besides the easily evoked causes such as renal failure, adrenal insufficiency, cell lysis or iatrogenic causes, false or pseudo-hyperkalemia should not be forgotten.ObservationsThree patients (1 man, 2 women, aged 78, 84, 88) were managed for thrombocytosis (between 1306 and 2404 G/L) and non-symptomatic hyperkalemia (between 6.1 and 7.7mmol/L) are reported. Kalemia on blood collected in heparin tube was normal (4.4-4.6mmol/L). Therefore, no specific treatment for this pseudohyperkalemia was required.ConclusionThe combination of thrombocytosis and non-symptomatic hyperkalemia should suggest the diagnosis of pseudohyperkalemia and should prompt for a control of kalemia on blood collected in heparin tube. The recognition of this diagnosis is important in order to avoid unnecessary and potentially deleterious treatment of hyperkalemia.Copyright © 2021 Société Nationale Française de Médecine Interne (SNFMI). Published by Elsevier Masson SAS. All rights reserved.

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