Cancer Antigen 19-9 (CA 19-9)
A tumor marker used mainly to monitor pancreatic and other gastrointestinal cancers over time.
Consider this test if:
- Monitoring disease status during or after treatment for a confirmed CA 19-9-producing cancer
- Following pancreatic, bile duct, liver, or colorectal cancer alongside imaging and clinical review
- Tracking a previously elevated CA 19-9 to see whether it is rising or falling
- Your care team is using it to help assess treatment response over time
- HSA/FSA eligible
- Typical results in 1-2 days · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
No fasting required. CA 19-9 is most informative when tracked serially under similar conditions, so consistency between draws matters. Benign causes such as bile duct obstruction, pancreatitis, and liver disease can elevate the result, which is why it is interpreted alongside imaging and clinical findings.
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What this test is for
CA 19-9 is a protein shed by certain gastrointestinal tumors, most notably cancers of the exocrine pancreas, and also bile duct, liver, and colorectal cancers. Its primary role is serial monitoring: in someone with a confirmed cancer that produces CA 19-9, a rising or falling level tracks disease status and response to treatment. It is not a screening test for healthy people, because levels also rise with benign conditions such as bile duct obstruction, pancreatitis, and liver disease, and because tumor size does not correlate cleanly with the number. Levels above 10,000 units/mL almost always indicate distant metastasis. This is distinct from the related tumor markers in our catalog: CA 125 is used mainly for ovarian cancer, and CA 27.29 for breast cancer.
- Specimen
- Serum or plasma
- Measures
- Concentration
What you'll learn
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Insights that connect the dots. A clinician reads your whole picture, not one result in isolation, connecting family history, past results, and lifestyle into clear next steps.
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Your personalized action plan. Nutrition, supplements, and training in one clinician-reviewed protocol, updated as your results change.
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Track your trends. Upload results from any lab and see each biomarker trend over time, so you know what is working.
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Never miss a recheck. Mito tells you what is worth retesting and when, then reminds you so nothing slips.
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1-2 days
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
Everything your health needs,
in one membership
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Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
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Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
Mito Membership
$9 /mo
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Without membership
$0
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost, covering the lab and what it takes to run the service. It is never a profit on the test itself. Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9 per month, and any applicable lab order or draw fee is itemized before you pay.
Where do I get tested?
Choose an available partner lab at checkout. If your cart contains multiple blood tests, Mito helps consolidate the eligible tests at one lab when possible. At-home kits and scans follow the collection or appointment process shown on their product page.
Is this eligible for HSA/FSA?
Yes. Eligible tests can be paid for with an HSA or FSA card at checkout.
When will I get my results?
Your results appear in your Mito dashboard after the laboratory completes processing. A clinician then reviews them before your analysis and personalized action plan are finalized. Timing varies by test, and specialty assays and at-home kits may take longer.
Do I need a physician's order?
No. Mito provides the laboratory order when one is required, so you do not need to arrange a separate physician visit before purchasing.
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