CA 19-9
Specialistalso —
What it isA carbohydrate antigen shed by pancreatic, biliary, and some gastrointestinal cancers.
DoesMonitors pancreatic and biliary cancer treatment response and recurrence; not for screening.
GoodA low CA 19-9 in a patient with treated pancreatic cancer signals disease control.
BadElevated CA 19-9 can indicate pancreatic or biliary malignancy but also rises in benign biliary obstruction, pancreatitis, and cirrhosis. Some people lack the enzyme to produce it and run falsely low.
- Standard
- <37 U/mL.
- Optimal
- 0–37 U/mL (lower is good)
- Modifiers
- Rises in benign biliary obstruction; absent in 5–10% of population.
How to optimize
- Lifestyle
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- Diet
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- Supplements
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- Peptides
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- Drugs
- Cancer-directed therapy when indicated.
Reference ranges are general adult lab norms; optimal ranges are editorial picks from the longevity literature — not medical advice. Always interpret results with your physician.
within Cancer Markers