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Cancer Antigen CA 15-3 Blood Test

* This is not a home test kit. You will need to visit a local lab for testing.

Cancer Antigen CA 15-3 Blood Test

Also Known As

CA-Breast, Cancer Antigen 15-3, Cancer Antigen-Breast

The Purpose of a CA 15-3 Test

Cancer antigen 15-3, or CA 15-3, is a protein that is produced by normal breast cells. However, cancerous cells can shed CA 15-3, so your levels increase, which is why a cancer antigen 15-3 blood test is used to monitor metastatic breast cancer tumors to see how they respond to treatment or detect a recurrence of the disease. This test may also be used for people with other types of cancer associated with high cancer antigen 15-3 levels, such as ovarian, lung, and colon cancers.

Cancer Antigen 15-3 (5819)
Cancer Antigen 15-3 (143404)

What Does the Cancer Antigen 15-3 Blood Test Measure?

The blood test measures the level of CA 15-3 in the body.

Who Should Take a CA 15-3 Blood Test?

Doctors often suggest using a CA 15-3 test for patients with advanced breast cancer as a way to track the effectiveness of treatment. It may be administered on its own or along with other cancer screening tests.

CA 15-3 Blood Test Preparation

No special preparation is needed before taking your CA 15-3 test.

Cancer Antigen 15-3 Results

Regular levels register up to 30 units per milliliter. Higher levels can indicate that the cancerous tumor continues to grow or that breast cancer has returned in patients that had been in remission. However, because other benign medical conditions are also associated with high CA 15-3 levels, your doctor may also recommend other breast cancer tests for the clearest answers. We also have board-certified doctors available to offer assistance during telehealth appointments.

Where Can I Get a CA 15-3 Test Near Me?

You never have to guess about your health status with Personalabs. Our online store offers a comprehensive collection of tests that deliver accurate data you can use to take power into your hands when it comes to making important healthcare decisions. We also offer you the convenience of booking your blood work at one of 4,000 labs nationwide; thanks to our partnerships with Labcorp and Quest Diagnostics, you’re sure to find a location near you.

Here’s how easy it is to get tested with Personalabs:

Step 1: Get the test you want online, then purchase it to download the lab order. (You may not need to get a doctor’s OK prior to ordering the test, depending on the state where you live.)

Step 2: Our lab locator will help you discover the closest facility near you. You can either make an appointment for your testing or walk in for your blood work; contact the lab to learn more about its policies.

Step 3: Bring the lab order to your blood draw and complete your testing.

Step 4: Your cancer antigen 15-3 results should arrive in your secure Personalabs account within 2 to 10 business days. (Contact us if you need help getting your results by a particular deadline, and we will work with the lab for you.)

Get the answers you need with Personalabs. Discover our selection of health tests today.

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Order Your Test

Create an account, choose your tests, checkout securely, generate your lab order



Generate & Print Out Lab Order

Our physician network will approve your order within 2-4hrs.



Visit the Lab

The test price decides which lab you will visit: Quest or Labcorp. Find a location in your area.



Get Your Results

Results can be provided in as little as 24-48 hrs. For more complex tests, please contact us for turn around times.

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