{"id":"creatine-kinase","name":"Creatine Kinase (CK), Total","shortName":"CK","aliases":["CK","CPK","CK, Total","Creatine Kinase","Creatine Kinase, Total","Creatine Phosphokinase","Creatine Kinase (CK)","Creatine Kinase (CK), Total","CK Total","Total CK","CPK, Total","Total CPK","Creatine Phosphokinase, Total","Creatine Kinase, Total, Serum or Plasma","Creatine Kinase, Serum","CK level","Creatinkinase","Créatine kinase","Creatina quinasa"],"abbreviations":["CK","CPK","Total CK"],"loinc":[{"code":"2157-6","primary":true}],"specimen":"serum-or-plasma","units":[{"ucum":"U/L","display":"U/L"},{"ucum":"ukat/L","display":"µkat/L"},{"ucum":"nkat/L","display":"nkat/L"}],"referenceRanges":[{"population":"Men, 19–49","low":26,"high":366,"unit":"U/L","unitDisplay":"U/L","note":"Quest Diagnostics' interval for men 19 to 49 (spectrophotometry). CK has a wide spread in healthy people, and labs differ: UW Medicine's lab menu prints 39-308 U/L for men and 26-192 U/L for women at all adult ages, and Labcorp's 2024 critical-value list prints 49-439 U/L for men and 32-182 U/L for women aged 18 to 50. CK also runs higher in people of African ancestry (Neal 2009, Brewster 2007), and many healthy people sit above printed limits (see the technical notes). ARUP prints 'refer to report' instead of a fixed interval. Use the range printed on your own report.","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Women, 19–49","low":20,"high":239,"unit":"U/L","unitDisplay":"U/L","note":"Quest Diagnostics' interval for women 19 to 49. Women usually run lower than men. Other labs print different limits (see the note on the men's interval).","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Men, 50–59","low":23,"high":325,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Women, 50–59","low":21,"high":240,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Men, 60–69","low":22,"high":308,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Women, 60–69","low":20,"high":243,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Men, 70–79","low":19,"high":278,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Women, 70–79","low":18,"high":225,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Men, 80+","low":17,"high":247,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]},{"population":"Women, 80+","low":16,"high":215,"unit":"U/L","unitDisplay":"U/L","sources":[{"title":"Creatine Kinase (CK), Total (test code 374)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/374/creatine-kinase-ck-total?cc=MASTER","publisher":"Quest Diagnostics"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"An enzyme found mostly in muscle. It leaks into the blood when muscle is strained or injured, so hard exercise is a common reason for a high result.","url":"https://bloodtesttracker.com/markers/creatine-kinase","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}