Sunquest Code:K  
Epic Code:LAB114Epic Name:Potassium
Order Instructions:Order KW for whole blood specimens.
Synonyms:K; Electrolytes
Methodology:Indirect potentiometric
St John/St Joseph/Woodwinds: ISE, diluted
Turnaround Time:Performed and reported 24 hours/day.

Collection Instructions

Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel), St Johns/St Joseph/Woodwinds-Green (lithium heparin, no gel) (Capillary (lithium heparin) gas tube, Red (no gel), Red or gold (gel), St Johns/St Joseph/Woodwinds - Red (no gel), Dry heparin syringe)
Collection Instructions:Samples from patients with extremely high WBC may have falsely high potassium because of in-vitro cytolysis (pseudohyperkalemia). If suspected, samples should be hand-carried to the laboratory and analyzed as whole blood to minimize mechanical damage to cells. Consider collecting in red no gel to eliminate cells traveling through gel barrier.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.1 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:1 week at room or refrigerated temperature; 1 year frozen.
Test Performed at or Referral Lab Chemistry  (University of Minnesota Health Maple Grove Clinics, Range, UMMC-East Bank, Oxboro Bloom, Lakes, Ridges, Northland, Southdale, UMMC/UMMCH-West Bank, M Health Clinic and Surgery Center, Grand Itasca, St. Joseph's, St. John's, Woodwinds)


Critical Range:Chemistry Reference Ranges and Critical Ranges  
Reference Range:Chemistry Reference Ranges and Critical Ranges  
Use:Evaluate potassium metabolism.

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