A visibly hemolyzed serum specimen produces a potassium result much higher than the patient's previous values. What is the best laboratory interpretation?

• 1 The result proves renal failure with acute tubular necrosis, often seen after crush injuries, and requires immediate dialysis
• 2 Hemolysis lowers potassium because red cells contain none of this ion, so the reading is falsely low and needs no repeat
• 3 The specimen should always be diluted and reported with a correction factor to account for hemolysis, as this is standard practice
• 4 In vitro red cell rupture may falsely increase potassium, so recollection and correlation are appropriate ✓ 정답

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