Abbreviation: CTFU
    
      Specimen Type: Urine-No preservativ
    
      Storage Temperature: Refrigerate
    
      Tubes / Containers: 24Hr Container, No Preservative (1)
    
      Instrument / Location: RPS
    
      Host Code: YCTFU
    
      LOINC: 2161-8, 2162-6, 2218-6, 49256-1, 2668-2
    
      Volume: 30 mL
    
      Minimum Volume: 4 mL
    
      Tab Assignment: RPS Sendouts
    
    
      Additional Information: Preservation can be enhanced by adjusting the pH to 2-3 by adding an acid such as 6 N HCl. Catecholamines are not stable above pH 7. The pH of such specimens must be adjusted by the addition of acid prior to transport. A pH less than 2 can cause assay interference.