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Tumor markers

CA 19-9

A carbohydrate marker associated with pancreatic and biliary disease.

Unit U/mLTypical adult range < 37 U/mL
What it is

A carbohydrate marker associated with pancreatic and biliary disease.

Why it matters

It is used to follow known disease rather than to look for it, and a change over time is what carries the information.

Reading the number

Anything that blocks or inflames a bile duct raises it, often dramatically and without cancer. Roughly one person in ten lacks the blood-group enzyme needed to make it at all, so their result stays near zero regardless -- which makes a low value uninformative for them.

What moves it
bile duct obstructionpancreatitisliver diseaseLewis blood group status
Read alongside
CEAAlkaline phosphataseBilirubin (total)
When to raise it

Worth discussing a rising trend together with the liver panel.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under CA 19-9.

CA 19.9Carbohydrate Antigen 19-9

Track your ca 19-9 over time.

CA 19-9 is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.