Creatine Kinase (CK) Test

Q: 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.

Q: 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.

Q: 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.

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.

Doctor's Assessment Included

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 ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

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 to prepare

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.

Test Products

This marker is included in the following test panels.

InsideTracker

InsideTracker Recovery

A 10-biomarker recovery panel inspired by InsideTracker's Recovery category — muscle enzymes, liver values, electrolytes, magnesium and vitamin D behind your recovery score.

Magnesium CRP (C-Reactive Protein) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) GGT (Gamma-Glutamyl Transferase) Albumin Creatine Kinase (CK) Sodium Potassium Vitamin D (25-OH)

€139,-

Health Checkups

InsideTracker

A 35-biomarker performance and longevity panel inspired by InsideTracker Ultimate — covering heart, hormones, metabolism, inflammation, recovery and iron status.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count

€399,-

Whoop

Whoop Performance Health

A 51-biomarker performance panel inspired by the WHOOP Performance Health Panel — recovery, blood production, thyroid, hormones, iron and nutrient status for people who train.

Complete Blood Count (CBC) ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) IGF-1 (Insulin-like Growth Factor) Creatine Kinase (CK) Reticulocytes Free T3 (Triiodothyronine) Free T4 (Thyroxine) Vitamin B12 Folate (Folic Acid) Bilirubin (Direct) Bilirubin (Indirect)

€689,-