Collect: Green (sodium or lithium heparin), lavender (EDTA), plain red, or serum separator tube.
Specimen Preparation: Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.2 mL)
Storage/Transport Temperature: Frozen.
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 http://www.aruplab.com/patienthistory or by contacting ARUP Client Services.
Unacceptable Conditions: Specimens exposed to more than one freeze/thaw cycle.
Stability (collection to initiation of testing): Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 2 weeks
Reference Interval:
Available Separately
Components
Reference Interval
Creatine, Plasma
By report
Guanidinoacetic Acid, Plasma
By report
CPT Code(s):
82540 Creatine; 83789 Guanidinoacetic acid
Cross References:
AGAT (Creatine Disorders Panel, Plasma or Serum), GAA + Creatine (Creatine Disorders Panel, Plasma or Serum), GAMT (Creatine Disorders Panel, Plasma or Serum), Guanidinoacetic Acid + Creatine (Creatine Disorders Panel, Plasma or Serum)
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