Ordering Recommendation

Initial test to diagnose or rule out creatine deficiency syndromes following clinical presentation. Order Creatine Disorders Panel, Serum or Plasma (2002328), simultaneously for proper result interpretation.

Mnemonic
CRTN DIS U
Methodology

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

Performed

Mon

Reported

2-9 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Random Urine.

Specimen Preparation

Transfer 2 mL urine to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.5 mL)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions
Remarks

Clinical information is needed for appropriate interpretation. Additional required information includes age, gender, diet (e.g., TPN therapy), drug therapy, and family history. Biochemical Genetics Patient History Form is available on the ARUP Web site at https://www.aruplab.com/patienthistory or by contacting ARUP Client Services.

Stability

Ambient: 6 hours; Refrigerated: 24 hours; Frozen: 6 months (Three freeze/thaw cycles are acceptable.)

Reference Interval

Reports include age appropriate reference intervals and interpretation

Test Number
Components
Reference Interval
Creatine, Urine By report
Guanidinoacetic Acid,  Urine By report
Creatinine, Urine By report

Interpretive Data



Compliance Category

Laboratory Developed Test (LDT)

Note
Hotline History
N/A
CPT Codes

82540; 82570; 82542

Components
Component Test Code* Component Chart Name LOINC
2002334 Creatinine, Urine 14683-7
2002336 Guanidinoacetic acid, Urine 34155-2
2002338 Creatine, Urine 34275-8
2002339 Creatine Disorder Urine Interpretation
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • AGAT
  • GAA & Creatine
  • GAA + Creatine
  • GAMT
  • Guanidinoacetic Acid + Creatine
  • Guanidnoacetic Acid & Creatine
Creatine Disorders Panel, Urine