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Laboratory Test Directory

Creatinine, Urine Output (Updated)


Name Method Department Units
Creatinine, Urine Timed Enzymatic, reflectometry
Core Lab, Chemistry, Routine

Specimen Requirements

Urine, 24 hours

Container Type Container Size Specimen Volume

24 hour urine container


Refrigerated - 5 day(s)
Room temperature - 3 day(s)

Specimen Preparation

  • Ship entire specimen to laboratory refrigerated

Reasons for Rejection

  • Use of urine preservative
  • Collected in diaper or cotton balls
  • Loss of some specimen during collection


Indicate start and stop time and date on the requisition. Timed urine specimen required (24 hour preferred). Instruct patient on proper collection procedure. At beginning of collection, have patient void and discard urine. Begin collection timing at this point and collect all urine until the end of collection period. Have patient void and save urine at the final collection period. Specimens collected in diaper and/or cotton balls are unacceptable.

CPT Code

  • 82570