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Creatine Kinase (CK) Test

Creatine kinase (CK) is an enzyme found primarily in the heart, brain, and skeletal muscles. When muscles are damaged or stressed, CK is released into the bloodstream, making it a useful marker of muscle health.

Turnaround up to 72 hours, estimate Turnaround: up to 72 hours after your blood draw (estimate).

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
u/l
Normal < 170 High
Female Your group
u/l
Normal < 145 High

Reference values can vary between laboratories. Discuss your results with your GP for explanation and treatment decisions.

Creatine Kinase (CK): what this test measures

This test measures the level of creatine kinase (CK) in your blood. Elevated CK levels indicate that muscle tissue has been damaged or is under significant stress, whether from physical exertion, injury, or an underlying condition.

Creatine Kinase (CK): why this value matters

CK is a reliable indicator of muscle damage. While elevated levels can follow intense exercise, persistently high levels may indicate conditions such as rhabdomyolysis, myocarditis, or muscular dystrophy. Monitoring CK helps distinguish normal post-exercise elevation from clinically significant muscle injury.

Creatine Kinase (CK): how the blood test works

Referral
No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw
A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Results
Turnaround: up to 72 hours after your blood draw (estimate).
Where
650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Creatine Kinase (CK): how to prepare

  1. No hard training beforehand

    Required

    No heavy training, long endurance sessions or anything that leaves you out of breath in the 72 hours before the draw. Normal walking is fine.

  • Water is always fine. Drink as usual beforehand, it makes the draw easier.
  • Take your usual medication, unless your own doctor told you otherwise.

Creatine Kinase (CK): when is testing worthwhile?

Testing may be recommended if you experience unexplained muscle pain, weakness, or dark-coloured urine. CK is also tested after significant physical trauma, during evaluation of chest pain, or to monitor individuals taking medications that can affect muscles (such as statins).

Creatine Kinase (CK): symptoms of a high or low value

Low Levels

Low CK levels are generally not a clinical concern. They may be associated with low muscle mass or a very sedentary lifestyle. In rare cases, very low levels can be seen in certain liver conditions. Consult a healthcare professional for interpretation of results.

High Levels

Elevated CK levels may indicate muscle injury from intense exercise, trauma, or conditions such as rhabdomyolysis. Persistently high levels may be associated with myocardial infarction, myositis, muscular dystrophy, or medication side effects. Consult a healthcare professional for interpretation of results.

Creatine Kinase (CK): lifestyle and this value

Allow adequate rest and recovery between intense workouts. Stay well hydrated, especially during and after vigorous exercise. If you are taking statins and experience persistent muscle pain, discuss CK monitoring with your healthcare professional. Gradual increase in exercise intensity can help reduce the risk of excessive muscle damage.

Creatine Kinase (CK): frequently asked questions

Can exercise cause elevated CK levels?

Yes, intense or unaccustomed exercise is one of the most common causes of temporarily elevated CK levels. Levels typically return to the reference range within a few days of rest. Persistent elevation without recent exercise warrants further evaluation.

Should I avoid exercise before a CK test?

Your healthcare professional may advise you to avoid strenuous exercise for 24 to 48 hours before the test to obtain a baseline reading. Always follow the specific instructions provided to you.

What is rhabdomyolysis?

Rhabdomyolysis is a serious condition where damaged muscle tissue breaks down rapidly, releasing CK and other substances into the blood. It can lead to kidney damage. Symptoms include severe muscle pain, weakness, and dark-coloured urine. Seek medical attention immediately if you suspect rhabdomyolysis.

Results without a doctor's assessment

You receive your values with the unit and reference range. A doctor's assessment is not part of this site. Discuss your results with your GP for explanation and treatment decisions.

Creatine Kinase (CK)

€10,-