CA-125 levels: what's normal, high and low
A protein elevated in many ovarian cancers. Also rises with benign conditions like endometriosis or menstruation.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
The short answer
CA-125 is measured with a standard blood draw; no fasting is needed. A typical reference range is 0.000 – 35.0 U/mL. At TestWell it's $34.99 all-in as CA-125 (Ovarian Cancer Marker), results in 2–4 business days, drawn at Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.
- Units
- U/mL
- Sample
- Blood draw
- Fasting
- Not required
- Results
- 2–4 business days
- Price
- $34.99
- Labs
- Labcorp
CA-125 Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 0.000 – 35.0 U/mL |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your CA-125 result may mean
Most often monitored in known ovarian cancer. Many benign causes — interpretation requires clinical context.
What a high CA-125 means: causes, symptoms, next steps →Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
How do you get a CA-125 test?
Order online, a licensed physician reviews the requisition, and you walk into a nearby lab for the draw. CA-125 is available on its own or inside these panels — panels cost less per marker when you want the fuller picture.
| Option | Includes | Price |
|---|---|---|
| CA-125 (Ovarian Cancer Marker) | This marker only | $34.99 |
| Women's Cancer Screening Panel | 12 tests | $299.99 |
Quest vs. Labcorp for CA-125: which lab should you pick?
Both are CLIA-certified national labs and the result is clinically equivalent, so pick whichever location is closer. Your report will print that lab's own reference range, which can differ slightly from the table above.
| Lab | Available | Price |
|---|---|---|
| Quest Diagnostics | No | — |
| Labcorp | Yes | $34.99 |
| BioReference (NY & NJ) | No | — |
Need help choosing a location? Use the lab finder to see draw sites near your ZIP.
Related Heart Health biomarkers
Markers commonly tested alongside CA-125.
Frequently asked
Most often monitored in known ovarian cancer. Many benign causes — interpretation requires clinical context. A single result above the reference range is a prompt to look closer with a clinician — often a repeat test and related markers — not a diagnosis on its own.
Ready to test your ca-125?
Order in two minutes, get physician-approved, and visit a lab the same day. Starts at $34.99.