Lab test
Ovarian Cancer Blood Test - CA-125 Testing
The cancer antigen 125 test measures the amount of CA-125, a protein found on the surface of many ovarian cells, in the blood.
- Typical price
- From $158
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
The cancer antigen 125 test measures the amount of CA-125, a protein found on the surface of many ovarian cells, in the blood. It is used as a tumor marker to support the evaluation and monitoring of certain conditions, most often ovarian cancer. CA-125 can also be elevated for reasons unrelated to cancer, so it is not used alone to diagnose cancer. A healthcare provider interprets the result with imaging, symptoms, and other tests. It may be ordered before or during treatment to help track changes over time.
What this test measures
- Cancer antigen 125 (CA-125) A protein found on the surface of many ovarian cells; measured in blood as a tumor marker.
Who this test may be right for
- People being evaluated for a possible ovarian mass or related symptoms
- Individuals whose healthcare provider is monitoring a known ovarian condition
- People with a family history or risk factors their provider wants to assess
- Those whose healthcare provider uses CA-125 to track response over time
- Individuals with symptoms such as persistent abdominal bloating or pelvic discomfort
Before your visit
- No fasting is required for this blood test
- A standard blood draw is used to collect the sample
- Tell the lab about any recent procedures or conditions that may affect the result
- Follow any specific instructions supplied with your test order
Understanding your results
The CA-125 result is a numeric level compared with a reference range. An elevated level may be associated with ovarian cancer but can also occur with other conditions, so it is not a diagnosis by itself. A normal level does not rule out cancer. Because CA-125 is most useful when tracked over time, a healthcare provider interprets it with imaging, symptoms, and other findings. Discuss your CA-125 result with a healthcare provider before making any decisions.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does the CA-125 test measure?
It measures the amount of cancer antigen 125 in the blood, a protein found on the surface of many ovarian cells that is used as a tumor marker.
Can CA-125 be elevated without cancer?
Yes. CA-125 can be elevated for reasons unrelated to cancer, which is why an elevated result is interpreted alongside imaging, symptoms, and other tests rather than on its own.
Does the CA-125 test require fasting?
No. The CA-125 blood test does not require fasting.
What does the Ovarian Cancer Blood Test - CA-125 Testing measure?
The Cancer Antigen 125 (CA-125) test is used to evaluate the blood for CA-125, a cancer tumor marker.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Ovarian Cancer Blood Test - CA-125 Testing results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
Laboratory services are provided by independent, CLIA-certified testing partners. Availability, pricing, and turnaround times can vary by location and are confirmed at checkout.