OBJECTIVES Investigate concomitant and spurious high potassium and low sodium results in heparinized plasma. METHODS Potassium and sodium values were measured from heparinized plasma and serum in a patient with B-cell non-Hodgkin lymphoma using both an automated chemistry analyzer (indirect ion selective electrode) and blood gas analyzer (direct ion selective electrode). RESULTS Potassium levels were significantly increased while sodium levels were significantly decreased in heparinized plasma compared to serum on several occasions. CONCLUSIONS To our knowledge, concomitant reverse pseudohyperkalemia and pseudohyponatremia has not been reported previously. We postulate the discrepancy between plasma and serum sodium (pseudohyponatremia in plasma) may be unique to cases of reverse pseudohyperkalemia with extreme potassium elevations.

中文翻译：

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B细胞非霍奇金淋巴瘤患者的假性高钾血症和假性低钠血症。

目的研究肝素化血浆中伴随的和虚假的高钾低钠结果。方法使用自动化学分析仪（间接离子选择电极）和血气分析仪（直接离子选择电极），从B细胞非霍奇金淋巴瘤患者的肝素化血浆和血清中测定钾和钠值。结果与血清相比，肝素化血浆中钾水平显着升高而钠水平显着降低。结论据我们所知，先前尚未报道反向假性高钾血症和假性低钠血症。我们推测血浆和血清钠之间的差异（血浆中的假性低钠血症）可能是钾离子极度升高的反向假性高钾血症的病例所独有。