Serum Creatinine Phosphokinase (CPK) Activity (Total)
This test measures the total activity of Creatine Phosphokinase (CPK), an enzyme found in heart, skeletal muscle, and brain tissues. It helps assess muscle damage or heart-related conditions.
["CPK helps identify muscle or heart injury by measuring enzyme release into the bloodstream."]
Key facts at a glance
- LOINC
- 24218-0
- Short code
- FLUBV Ab sp2 Titr Ser CF
- Synonyms
- FLUBV Ab sp2 Titr Ser CF
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- comp-fix
- 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 Is Creatine Phosphokinase (CPK)?
Creatine phosphokinase (CPK), also called creatine kinase (CK), is an enzyme that helps cells produce energy. It’s naturally present in the heart, brain, and muscles. When these tissues are damaged—such as from a heart attack, muscle injury, or stroke—their CPK levels rise in the blood. This test checks for elevated CPK levels to detect or monitor such damage.
Why Is This Test Done?
Doctors may order CPK testing to investigate symptoms like chest pain, muscle weakness, or unexplained fatigue. It’s also used to monitor conditions like heart disease, muscle disorders, or neurological issues. Elevated CPK can signal recent trauma, inflammation, or organ stress.
When Might You Need This Test?
You might need this test if you have symptoms like unexplained muscle pain, weakness, or fatigue, especially after physical exertion or injury. It’s also part of routine checks for heart conditions, muscle diseases, or before certain medical procedures.
What to Expect Before the Test
No special preparation is needed, but avoid strenuous exercise 24 hours before testing. If you’re on medications, let your provider know—some may affect results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
CPK levels can indicate muscle or heart damage, helping diagnose conditions like myocarditis, rhabdomyolysis, or muscle disorders. High levels may also signal early heart attack symptoms or severe muscle injury, prompting further evaluation.
Short name
CPK Total Serum
Frequently asked questions
What causes CPK levels to rise?
How long does it take to get results?
Can diet or exercise affect CPK levels?
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