Liver health
Understanding liver markers
3 min read
Signals, not a diagnosis
ALT and AST are enzymes measured in blood tests. Changes can have several causes and do not, by themselves, identify a particular liver condition. AST is also found in other tissues, including muscle.
Keep the report's reference range
Laboratories may use different methods and ranges. Lumen compares a numeric reading only with a range you have checked against that report. Missing ranges are left unassessed rather than filled in with a generic target.
Ask about the next step
Bring your results and a list of medicines and supplements to your doctor. They can decide whether repeat tests or other investigations are needed. Do not dismiss persistent changes or symptoms because a change looks small on a chart.
Further reading
Educational editorial content, updated 25-Oct-2026. Not a clinician-reviewed assessment. External sources may describe guidance for a particular country. Discuss what applies to you with your clinician.
This article is for general information and education only. It is not medical advice and cannot account for your personal history. Always consult a qualified healthcare professional about your results.