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Serum Creatinine Phosphokinase (CPK) Isoenzyme Profile (Total CPK)

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

This test measures different types of Creatine Phosphokinase (CPK), an enzyme found in heart, muscle, and brain cells. It helps identify which tissues may be damaged or stressed.

Quick summary

["CPK isoenzymes can pinpoint whether muscle, heart, or brain injury is suspected."]

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

Key facts at a glance

LOINC
33460-7
Short code
ENA SM+RNP IgG Ser Ql
Synonyms
ENA SM+RNP 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

Why This Test Is Done

Your doctor may order this test to check for muscle damage (myopathy), heart problems (like a heart attack), or nerve/brain conditions. It’s also used when symptoms like muscle weakness, chest pain, or confusion appear.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. Avoid strenuous exercise or heavy lifting 24 hours before the test to get more accurate results.

What the Results Mean

CPK comes in three main types: CPK-MM (mostly in muscles), CPK-MB (heart-specific), and CPK-BB (brain-specific). Elevated levels of CPK-MB can signal heart damage, while muscle damage may raise CPK-MM. Brain-related issues rarely affect CPK levels.

Common Causes of Abnormal Results

High CPK levels can occur from muscle injuries, infections, or conditions like myositis. Heart attacks often raise CPK-MB. Low levels may suggest muscle wasting or certain metabolic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CPK isoenzyme testing is critical for diagnosing conditions like myocardial infarction (heart attack), rhabdomyolysis (severe muscle breakdown), or neurological disorders. Early detection can guide treatment and prevent complications.

Short name

CPK Isoenzyme Levels

Frequently asked questions

How long does it take to get my CPK isoenzyme results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing time. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this blood test?
You can eat and drink normally before the test. Avoid heavy meals or alcohol 24 hours beforehand, as they might affect muscle enzyme levels.
What if my CPK levels are high?
If your CPK levels are elevated, your doctor will investigate possible causes like muscle strain, heart issues, or other conditions. They may recommend further tests or adjustments to your activity level.
  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