Creatine Disorders Panel, Urine




Test Mnemonic

UGUANI

CPT Codes

  • 82542 - QTY (1)
  • 82540 - QTY (1)
  • 82570 - QTY (1)

Includes

  • Creatine/Creatinine ratio, Guanidinoacetic Acid

Performing Laboratory

ARUP

FDA Category

Laboratory Developed Test


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
2 mLUrine, randomClean container FrozenFreeze immediately. Clinical information is necessary for appropriate interpretation. Additional required information includes age, gender, diet (e.g., TPN therapy), drug therapy, and family history. Please submit Patient History for Creatine Deficiency Syndromes Testing form AND Biochemical Genetics Patient History form with specimen.

Alternate Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
2 mLUrine, timed (well-mixed)Clean container FrozenFreeze immediately. Clinical information is necessary for appropriate interpretation. Additional required information includes age, gender, diet (e.g., TPN therapy), drug therapy, and family history. Please submit Patient History for Creatine Deficiency Syndromes Testing form AND Biochemical Genetics Patient History form with specimen.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mL     

Stability

Environmental Condition Description
AmbientUnacceptable
RefrigeratedUnacceptable
Frozen2 weeks (Avoid repeated freeze/thaw cycles)

Days Performed

Mon

Turnaround Time

3 - 10 days

Methodology

Name Description
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) 

Reference Range

Special Info

Clinical information is necessary for appropriate interpretation. Additional required information includes age, gender, diet (e.g., TPN therapy), drug therapy, and family history. Please submit Patient History for Creatine Deficiency Syndromes Testing form AND Biochemical Genetics Patient History form with the specimen. Specimens exposed to more than one freeze/thaw cycle will be rejected. This test is New York DOH approved.

Clinical Info

Initial test to diagnose or rule out creatine deficiency syndromes following clinical presentation. For proper result interpretation, order serum/plasma testing simultaneously.