Definition: A spurious elevation of the serum concentration of potassium occurring when potassium is released in vitro from cells in a blood sample collected for a potassium measurement. This may be a consequence of disease (myeloproliferative disorders with marked leukocytosis or thrombocytosis) or as a result of improper collection technique with in vitro hemolysis.
[pseudo + G. hyper, above + L. kalium, potassium, G. haima, blood]
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