CPK (Creatine Kinase) Test
A blood test that measures creatine kinase, an enzyme released when muscles are damaged.
Quick Summary
To check for muscle damage, such as from statins, injury or muscle diseases.
Creatine kinase level.
Avoid heavy exercise for 48 hours before.
Overview
Exercise and injections can raise CK.
Very high levels can harm the kidneys.
What It Measures
CK
Muscle enzyme.
How It's Performed
- 01
Preparation
Usually no special preparation unless your doctor advises.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm.
- 03
Afterwards
Press on the spot; a small bruise is common.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| CK (men) | 39–308 | U/L |
| CK (women) | 26–192 | U/L |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories; use the range on your report. Your doctor will explain what your result means and what happens next.
If values are High:
High CK suggests muscle damage.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Creatine Kinase(opens in a new tab) · MedlinePlus, US National Library of Medicine