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The page below is a sample from the LabCE course Minimizing Pre-Analytical Variability During Venipuncture and Urine Sample Collection Processes. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Case Study: Highly-Elevated Serum Potassium

A chemistry laboratory supervisor sees a serum potassium of 6.2 mEq/L (reference interval 3.5 -5.3) on her critical results log, with a comment, "results checked." She notices that the previous result on this patient was 4.9 mEq/L.
What should be included in the investigation of this finding?