Ordering Recommendation

Monitor patients receiving creatine supplementation.

Mnemonic
CRTN SP
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

Plain Red, Serum Separator Tube (SST), Green (Sodium or Lithium Heparin), or Lavender (K2EDTA).

Specimen Preparation

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)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions
Remarks
Stability

Ambient: 6 hours; Refrigerated: 1 week; Frozen: 6 months (Three freeze/thaw cycles are acceptable.)

Reference Interval

Effective May 20, 2013

Age
Reference Interval
10 years or less 37.0 - 117.0 µmol/L
11 years or greater 9.0 - 90.0 µmol/L

Interpretive Data



Compliance Category

Laboratory Developed Test (LDT)

Note

To evaluate inherited disorders of creatine metabolism or transport, please order Creatine Disorders Panel, Plasma or Serum (ARUP test code 2002328) and/or Creatine Disorders Panel, Urine (ARUP test code 2002333).

Hotline History
N/A
CPT Codes

82540

Components
Component Test Code* Component Chart Name LOINC
2002331 Creatine, Serum/Plasma 15045-8
2002342 Creatine, Serum/Plasma - mg/dL 2148-5
* 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
  • serum or plasma creatine
Creatine, Serum or Plasma