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Serum Creatinine Phosphokinase (CPK) Activity

Published: August 9, 2026Updated: August 16, 2026

This test measures the activity of creatine phosphokinase (CPK), an enzyme found in heart, muscle, and brain tissues. It helps assess damage to these organs.

Quick summary

["CPK levels can signal muscle, heart, or brain injury."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
22295-0
Short code
EBV EA IgG Ser Ql
Synonyms
EBV EA IgG Ser Ql
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

What CPK Does in Your Body

CPK is released into the bloodstream when muscle or organ cells are damaged. Elevated levels may indicate recent trauma, muscle disorders, heart problems, or neurological conditions.

Common Causes of Elevated CPK

High CPK levels can result from muscle strain (e.g., intense exercise), muscle diseases (e.g., myositis), heart attacks, or conditions affecting the brain or nerves.

When This Test Might Be Ordered

Your doctor may request this test if you have symptoms like muscle pain, weakness, chest pain, or if you’ve experienced recent trauma or surgery.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. Avoid strenuous activity 24 hours before testing if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CPK Serum

Frequently asked questions

Why might my CPK test be ordered?
Your doctor may order this test to investigate unexplained muscle pain, weakness, or if you’ve had recent trauma, surgery, or symptoms like chest pain.
What do my CPK results mean?
Results are compared to a baseline or reference range for your age/health. High levels may need further evaluation (e.g., additional blood tests, imaging) to determine the cause.
Can I lower my CPK levels naturally?
Rest, gentle exercise, and avoiding overexertion can help if CPK is elevated due to muscle strain. Follow your doctor’s advice for any underlying condition.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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