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

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

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

Quick summary

["CPK levels can indicate muscle or heart injury and guide treatment decisions."]

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

Key facts at a glance

LOINC
23280-1
Short code
M meleagridis Ab Ser Ql HA
Synonyms
M meleagridis Ab Ser Ql HA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
1.5
Ref high
9
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ha
CPT
83002
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 Matters for You

CPK is released into the bloodstream when muscle or heart cells are damaged. Elevated levels may signal conditions like heart attacks, muscle injuries, or neurological issues. Your doctor may order this test to diagnose or monitor these problems.

Common Causes of Abnormal Results

High CPK levels can result from muscle strains, overexertion, certain medications, or underlying conditions like myopathies or heart disease. Low levels may occur in rare cases of muscle wasting or certain metabolic disorders.

What to Expect Before the Test

No special preparation is needed, but avoid strenuous exercise 24 hours before testing. If you’re on medications that affect muscle function, discuss this with your doctor.

What the Results Mean

Results are compared to a baseline or reference range provided by your lab. While specific ranges vary, very high levels often prompt further investigation into muscle or heart damage.

Reference range

Follicular: 1.5-9.0 mIU/mLN/A

Specimen: serum

For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Creatine Phosphokinase (CPK)

Frequently asked questions

What does a high CPK level mean?
A high CPK level may suggest recent muscle injury, heart problems, or other conditions causing cell damage. Your doctor will review your full medical history and other test results to determine the cause.
How often should I get this test?
Your doctor will decide how often to check CPK levels based on your symptoms, medical history, and treatment plan. Regular monitoring may be needed if you have conditions like heart disease or muscle disorders.
Can lifestyle changes affect CPK levels?
Yes, avoiding overexertion, managing stress, and following a balanced diet can help maintain stable CPK levels. If you suspect muscle strain or injury, rest and consult your doctor.
  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