Creatine Kinase (CK) Test
Creatine Kinase (CK) Test is a laboratory test you can order directly. A creatine kinase (CK) test measures the amount of CK, an enzyme found mainly in muscle, in your blood. It is ordered when a clinician suspects muscle damage, inflammation, or breakdown from injury, strenuous exercise, or certain medications. It can also help monitor muscle conditions over time.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $28
- Referral
- Not required
A creatine kinase (CK) test measures the amount of CK, an enzyme found mainly in muscle, in your blood. It is ordered when a clinician suspects muscle damage, inflammation, or breakdown from injury, strenuous exercise, or certain medications. It can also help monitor muscle conditions over time.
What it measures
- Total CK — The overall amount of CK enzyme in the blood.
- CK-MM — The form found mostly in skeletal muscle.
- CK-MB — The form found mostly in heart muscle.
- CK-BB — The form found mostly in the brain and smooth muscle.
Who it is for
A clinician may order this test if you have muscle pain, weakness, dark urine, or swelling, or if you take a medication that can affect muscles. It is also used to follow known muscle conditions.
Preparation
No fasting is required. Tell your clinician about recent strenuous exercise, injections, or muscle injury, because these can raise CK levels.
Results and what they mean
Results are reported as a number in units per liter, often with a reference range. A clinician interprets the result alongside your symptoms, medications, and activity level. This is general information, not medical advice; discuss your results with a qualified healthcare professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the creatine kinase (ck) test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Can exercise affect my CK result?
Yes. Strenuous or unfamiliar exercise can raise CK levels, sometimes for several days. Tell your clinician about recent activity.
Do I need to fast for this test?
No. Fasting is not required for a CK test.
What can cause high CK levels?
Muscle injury, intense exercise, certain medications, and some medical conditions can raise CK. A clinician will consider the full picture.
How long until I get results?
Results are typically available within 1 to 3 business days.