Creatine Kinase

Cleveland HeartLab C, Standard Laboratory Tests, Test

CPT Code: 82550
Order Code: C137
ABN Requirement:  No
Synonyms: CK; Total CK; Creatine Phosphokinase; CPK
Specimen: Serum
Volume: 0.5 mL
Minimum Volume: 0.2mL
Container: Gel-barrier tube (SST, Tiger Top)


  1. Collect and label sample according to standard protocols.
  2. Gently invert tube 5 times immediately after draw. DO NOT SHAKE.
  3. Allow blood to clot 30 minutes.
  4. Centrifuge at 1300 rcf for 10 minutes.

Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions provided with the Cleveland HeartLab, Inc. shipping box.


Ambient (15-25°C): 2 days
Refrigerated (2-8°C): 7 days
Frozen (-20°C): 4 weeks
Deep Frozen (-70°C): 4 weeks

Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits; hemolyzed specimens

Methodology: Photometric

Turn Around Time: 1 to 3 days

Reference Range:

Age Male
All Ages 20-200 20-180


Critical Value:

Age Critical Value U/L
All Ages ≥10,000


Intended Use: Creatine kinase testing may be ordered for individuals suspected of having a myocardial infarction or for evaluation of skeletal muscle disorders.

Limitations: Cyanokit (Hydroxocobalamin) may cause interference with results. In very rare cases gammopathy may cause unreliable results. Non-hemolyzed samples are recommended by the IFCC for testing. Highly lipemic specimens may cause unreliable results.