Leakage from erythrocytes when separation of serum from clot is delayed (plasma K+ normal)
Marked thrombocytosis or leukocytosis with release of intracellular K+ (plasma K+ normal)
Repeated fist clenching during phlebotomy, with release of K+ from forearm muscles
Specimen drawn from arm with intravenous K+ infusion
Decreased K+ excretion
Kidney disease, acute and chronic
Renal secretory defects (may or may not have reduced kidney function): kidney transplant, interstitial nephritis, systemic lupus erythematosus, sickle cell disease, amyloidosis, obstructive nephropathy
Type IV renal tubular ...