Cancer Antigen 125 (CA 125)
The main blood marker for monitoring ovarian cancer treatment and watching for recurrence.
Consider this test if:
- Monitoring response during or after treatment for ovarian cancer
- Surveillance for recurrence following first-line therapy
- Evaluating a pelvic mass or persistent gynecologic symptoms alongside imaging
- Tracking a previously elevated level to confirm it is falling
- 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. Timing matters for interpretation: testing is best deferred until at least three weeks after completing primary chemotherapy and at least two months after abdominal surgery, since recent treatment and surgery distort the result. Menstruation, pregnancy, and benign gynecologic conditions can also raise the value.
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What this test is for
CA 125 is a protein shed by many ovarian cancer cells, measured in blood to track disease activity over time. Its primary value is serial monitoring: a falling level during or after treatment suggests response, while a rising level can signal residual or recurrent serous ovarian carcinoma before imaging confirms it. Elevated CA 125 is not specific to cancer, since benign conditions such as endometriosis, ovarian cysts, uterine fibroids, pelvic inflammation, menstruation, and pregnancy raise it, and other malignancies (endometrial, breast, gastrointestinal) can too. For that reason it is most useful when trended in someone with a known diagnosis rather than read as a one-time screen in the general population. This is the ovarian-focused marker; the related CA 19-9 is used mainly for pancreatic and biliary cancers and CA 27.29 for breast cancer monitoring.
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
pay as you go
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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 — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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