Lab test

Creatine Kinase (CK) Test - Blood Testing

The creatine kinase (CK) blood test measures the level of this enzyme, which is found mainly in skeletal muscle, heart muscle, and the brain.

Typical price

From $28

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

The creatine kinase (CK) blood test measures the level of this enzyme, which is found mainly in skeletal muscle, heart muscle, and the brain. When muscle is damaged, CK leaks into the blood and the level rises. Testing helps evaluate muscle pain or weakness, detect muscle injury such as rhabdomyolysis, investigate inherited muscle disorders, and assess muscle-related side effects of medications. A total CK result is interpreted with your symptoms, activity, and other tests.

• Creatine Kinase (CK) Total Measures the total amount of CK enzyme in the blood, reflecting muscle and other tissue breakdown.

• People with muscle pain, weakness, or cramps
• Individuals with dark urine or suspected muscle injury
• Patients taking medications that can affect muscle
• People being evaluated for inherited muscle disorders
• Patients whose provider is assessing muscle damage

• Avoid strenuous exercise for several days before testing unless instructed otherwise
• Report all medications, including cholesterol-lowering drugs
• Tell the phlebotomist about recent injuries, injections, or seizures
• No fasting is usually required

A high CK level usually indicates muscle breakdown, which can result from injury, intense exercise, medications, or muscle disease. Markedly elevated levels may raise concern for rhabdomyolysis, especially with dark urine or kidney symptoms. A normal level does not exclude all muscle conditions. Discuss your creatine kinase result and what it may mean with a healthcare provider.

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