Serum Creatinine Phosphokinase (CPK) Isoenzyme Assay (Total CPK)
This test measures the total amount of creatine phosphokinase (CPK), an enzyme found in heart, muscle, and brain cells. CPK helps your body produce energy and can rise if these tissues are damaged.
["CPK levels can signal muscle or heart injury, helping doctors diagnose conditions like heart attacks or muscle disorders."]
Key facts at a glance
- LOINC
- 110122-9
- Short code
- T sol lar IgG Msmt Ser
- Synonyms
- T sol lar IgG Msmt Ser
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
Why CPK Levels Matter in Your Body
CPK is an enzyme that plays a role in energy production within cells. It’s naturally present in high concentrations in the heart, skeletal muscles, and brain. When these tissues are damaged—due to injury, illness, or overexertion—their CPK levels can increase in the bloodstream. This test helps doctors identify whether you’ve experienced recent trauma to these organs or tissues.
When This Test Is Ordered
Your healthcare provider may order this test if you have symptoms like chest pain, muscle weakness, or unexplained fatigue. It’s also used after a heart attack, stroke, or severe muscle injury to monitor recovery. Sometimes, it’s included in routine check-ups for people at higher risk of heart or muscle conditions.
What to Expect Before the Test
No special preparation is needed for this blood test. You’ll typically have a small needle inserted into your arm to draw a blood sample. If you’re nervous, let your healthcare provider know—they can help make it more comfortable.
What the Results Mean
Higher-than-normal CPK levels may indicate recent tissue damage, while very low levels might suggest certain muscle or nerve disorders. Your results will be reviewed by a healthcare provider to determine if further testing or treatment is needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: CPK and Health
Short name
Total Creatine Phosphokinase (CPK)
Frequently asked questions
What causes CPK levels to rise?
How long does it take for CPK levels to return to normal?
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