Used in monitoring pancreatic and biliary tract cancers. Cannot be produced by patients with Lewis blood group antigen negative (~5–10% of population).
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | < 37 | Normal <37; markedly elevated (>1000) suggests unresectability |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.