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Muscle Creatine Kinase (CK) with Creatine Phosphokinase Isoenzyme Profile (Cardiac-Specific)

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

This test measures creatine kinase (CK), an enzyme found in heart, muscle, and brain tissues, along with a specific isoenzyme form (CK-MB) that is primarily produced in heart muscle. It helps assess damage to heart tissue.

Quick summary

["This test helps identify heart muscle injury and guides treatment decisions for conditions like heart attacks."]

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

Key facts at a glance

LOINC
89828-8
Short code
CT Guided Muscle Super Bx
Synonyms
CT Guided Muscle Super Bx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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 if you have symptoms like chest pain, shortness of breath, or unusual fatigue that could suggest heart muscle damage. It’s also used after a heart attack to monitor recovery or in cases of suspected heart-related muscle injury from conditions like heart surgery or severe exercise.

What to Expect Before the Test

No special preparation is needed. Blood is drawn from a vein, usually in your arm. You may feel slight discomfort, but it’s brief. If you’re on blood thinners, let your doctor know before the test.

What the Test Results Mean

Elevated levels of CK-MB or specific isoenzymes may indicate heart muscle injury. Your doctor will compare results with your symptoms and other tests to diagnose conditions like a heart attack or myocarditis.

Common Conditions Monitored

This test helps diagnose or evaluate heart-related issues such as myocardial infarction (heart attack), myocarditis (inflammation of the heart muscle), or conditions causing heart muscle stress (e.g., severe exercise or heart surgery).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CK-MB Cardiac Isoenzyme Profile

Frequently asked questions

What causes elevated CK-MB levels?
Elevated CK-MB levels can result from heart muscle damage, such as during a heart attack, heart surgery, or severe heart conditions like myocarditis. Other causes may include muscle injuries, certain medications, or metabolic disorders. Symptoms like chest pain, shortness of breath, or fatigue often accompany these elevations.
How long does it take to get results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
Can lifestyle changes affect CK-MB levels?
While extreme physical exertion or muscle injuries can temporarily raise CK-MB levels, healthy lifestyle habits like balanced diet, regular exercise, and avoiding smoking generally support normal enzyme levels. Stress or certain medications may also influence results, so discuss any concerns with your healthcare provider.
  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