Serum Creatinine Phosphokinase (CPK) Activity
This test measures the activity level of Creatine Phosphokinase (CPK), an enzyme found in heart, muscle, and brain tissues. It helps assess damage or injury to these organs.
["CPK helps identify muscle, heart, or brain injuries by measuring enzyme release into the bloodstream."]
Key facts at a glance
- LOINC
- 28547-8
- Short code
- N men sg C IgG Ser IA-mCnc
- Synonyms
- N men sg C IgG Ser IA-mCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Does CPK Measure?
CPK, or Creatine Phosphokinase, is an enzyme that plays a role in energy production in cells. When tissues like the heart, muscles, or brain are damaged, CPK leaks into the bloodstream, increasing its levels. This test helps doctors detect conditions such as heart attacks, muscle injuries, or neurological issues.
Why Might You Need This Test?
Your doctor may order a CPK test if you have symptoms like chest pain, muscle weakness, or unexplained fatigue. It’s also used to monitor conditions like heart disease, muscle disorders, or to check for complications from injuries or surgeries.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast before the test, but this depends on your doctor’s instructions. Bring any medications you’re taking to your appointment.
What Happens During the Test?
A healthcare professional will draw blood from a vein in your arm. The process is quick and typically causes minimal discomfort. The blood sample will be sent to a lab for analysis.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated CPK levels can signal muscle damage, heart attack, or other serious conditions. While CPK is most commonly associated with heart issues, it can also indicate muscle injuries, stroke, or certain neurological disorders. Your doctor will interpret results in the context of your symptoms and medical history.
Short name
CPK Serum
Frequently asked questions
What causes CPK levels to rise?
How long does it take to get results?
Can CPK levels be affected by diet or exercise?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy