Creatine and liver function tests: what to know

A liver function test is a group of blood measurements that can suggest irritation of liver cells, changes in bile flow or altered protein production. One result rarely explains its own cause. Tell the clinician about creatine, other supplements, strenuous exercise, alcohol, prescribed medicines and recent illness before testing. Abnormal results can have many explanations, including viral hepatitis, alcohol-related liver disease, medication effects or a problem outside the liver. The result needs context such as symptoms, previous tests and examination findings.

Give the full product name, dose instructions and start date for every supplement. Do not restart or increase creatine to test whether a result changes. Follow the laboratory's preparation instructions and ask whether strenuous exercise or a temporary supplement pause could affect interpretation. A clinician may repeat the blood test, review medicines or arrange additional tests. Never stop an essential prescription without advice.

Contact a clinician promptly for yellowing of the skin or eyes, dark urine, unusually pale stools, increasing abdominal swelling, persistent vomiting, confusion or severe right-sided abdominal pain. These symptoms need medical assessment regardless of whether creatine is involved.

Which parts of my liver function test are outside the expected range? Could my supplement, exercise, alcohol or medicines contribute? Do I need a repeat Liver Function Test or tests for hepatitis?