Initial test to diagnose or rule out creatine deficiency syndromes following clinical presentation. Order Creatine Disorders Panel, Urine (2002333), simultaneously for proper result interpretation.
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
New York DOH Approval Status
Green (Sodium or Lithium Heparin), Lavender (K2EDTA), Plain Red, or Serum Separator Tube (SST).
Separate from cells within 6 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.2 mL)
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.
Ambient: 6 hours; Refrigerated: 1 week; Frozen: 6 months (Three freeze/thaw cycles are acceptable.)
|Creatine, Serum/Plasma||By report|
|Guanidinoacetic Acid, Serum/Plasma||By report|
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
|Component Test Code*||Component Chart Name||LOINC|
|2002330||Guanidinoacetic acid, Serum/Plasma||33244-5|
|2002332||Creatine Disorder Serum/Plasma Interp|
- Creatine, Plasma
- Creatinine, plasma
- GAA & Creatine
- GAA + Creatine
- Guanidinoacetic Acid and Creatine
- Guanidinoacetic Acid + Creatine
- Guanidinoacetic acid, plasma