Cardiac / Muscle
Also known as: CK, total CK, creatine phosphokinase
Seek immediate medical attention if you experience severe muscle pain, weakness, dark urine, chest pain, or symptoms of a stroke.
This test checks how much creatine kinase (CK) is in your blood. CK is a protein. It helps your muscles, heart, and brain make energy.
Your doctor orders this test to look for muscle damage. This includes damage to your heart or brain. They might order it if you have muscle pain or feel weak. They also order it if you have had an injury.
Reference ranges for CK can vary by laboratory, and normal levels depend on your age, sex, race, muscle mass, and physical activity.
Clinical Reference
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Educational purposes only — This information is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your lab results with your healthcare provider.