Hyperkalemia is defined as measured serum [K+] of greater than 5.5 meq/L. If hyperkalemia is noted, oliguric renal failure, severe hemolysis, or excessive tissue breakdown should be suspected. However, the most common cause of hyperkalemia is pseudohyperkalemia. This may be due to hemolysis during blood draw or from breakdown of cells if blood is not analyzed within 30 min of phlebotomy. Other causes of hyperkalemia are listed in T§b.!§...2.3.-8,.
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