Creatine, Urine


Sunquest Code:UCRET  
Epic Code:LAB3894Epic Name:Creatine Timed Random Urine
Order Instructions:Order UCR (instead of UCRR); in addition to UCRET
Synonyms:UCRET
Methodology:Liquid Chromatography/Tandem mass spectrometry
CPT Code:82540
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 2-9 days.
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Urine Collection Procedure



Collection Instructions

Specimen:Urine, 24-hour timed collection or random sample.
Optimal Volume:Submit entire collection; analysis requires 0.5 mL
Container:3 L plastic jug (Plastic leakproof container, sterile)
Collection Instructions:Urine must be collected in plastic container and refrigerated (on ice) during collection.
Causes for Rejection:Acidified and preserved samples. Samples not collected on ice. Specimens exposed to more than one freeze/thaw cycle.


Processing and Shipping

Specimen Processing:Process and freeze ASAP. Centrifuge and aliquot 2 mL, 0.5 mL minimum. Freeze within 2 hours. Record total volume, duration and patient's gender on label.
Shipping Instructions:Ship on dry ice; keep frozen.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:2002343 (CRTN URINE)


Interpretive

Reference Range:By report. Report includes age appropriate reference intervals. Note: For random or timed specimens other than 24 hours, the result represents the total milligrams of creatine excreted during the collection period. Reference ranges for creatine have been established for random urine collections, in mmol/mol creatinine.
Use:Test should not be used to evaluate inherited disorders of creatine metabolism or transport. Please use Creatine Disorders Panel, Plasma or Serum (ARUP#2002328) and/or Creatine Disorders Panel, Urine (ARUP#2002333)


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