CA 15-3 Test: Booking, Price, and Results

About CA 15-3 Test: Booking, Price, and Results

Field	Value
Also Known As	CA 15.3, Cancer Antigen 15-3, CA-Breast, CA 153, Breast Cancer Marker, CA Breast Test
Sample Type	Venous blood (serum)
Fasting Required	No fasting required
Report Time	1 to 3 days
Recommended For	Adults of any gender with diagnosed breast cancer; primarily used for monitoring treatment and recurrence
Price	Starting at ₹1,250

What Is a CA 15-3 Test?

The CA 15-3 test measures the level of Cancer Antigen 15-3, a protein produced by breast cells, in the blood. When breast tumours are present, they can shed elevated amounts of this protein into the bloodstream. Doctors use this test mainly to monitor the progress of breast cancer treatment and to check for signs of recurrence. It is also known as the Cancer Antigen 15-3 test or the Breast Tumour Marker test.

What Does a CA 15-3 Test Measure?

The CA 15-3 Breast Cancer Marker test measures a single protein in your blood. Here is what it tells your doctor:

Parameter	What It Measures	Unit
CA 15-3	The level of Cancer Antigen 15-3 protein shed by breast tumour cells into the blood	U/mL

CA 15-3 does not cause cancer. It is a marker that tumour cells release, and tracking its level over time helps doctors understand how well treatment is working.

Why Is a CA 15-3 Test Done?

Doctors order the CA 15-3 test for several reasons, from monitoring known breast cancer to investigating unexplained symptoms.

Common Symptoms That May Require This Test

Your doctor may request this test if you are experiencing any of the following:

Unexplained weight loss
Persistent fatigue
Bone pain
Breast lumps or changes
Persistent cough or shortness of breath
Abdominal discomfort

Conditions This Test Can Help Detect

The Cancer Antigen 15-3 test is used in the context of several conditions. These include:

Monitoring treatment response in patients with metastatic breast cancer
Detecting early signs of recurrence in previously treated stage II and III breast cancer
Mild to moderate elevations can also appear in cancers of the lung, pancreas, ovary, prostate, and colon
Non-cancerous conditions such as cirrhosis, hepatitis, and benign breast disorders

CA 15-3 Test for Chronic Disease Monitoring

The CA 15-3 test plays an important role in the long-term care of breast cancer patients. Doctors typically order it every one to three months during active treatment, and every three to six months during the surveillance period after treatment ends, or as guided by your oncologist. Tracking the marker over time helps doctors assess whether the disease is responding to therapy or showing signs of returning.

How to Prepare and What to Expect

Preparing for the CA 15-3 Breast Cancer Marker test is straightforward. There are only a few simple things to keep in mind before your appointment.

Do You Need to Fast?

No fasting is required for this test. You can eat and drink as normal before your sample is collected.

There is one important exception: do not take multivitamin or dietary supplements containing biotin (vitamin B7) for at least 12 hours before your test. If you take high-dose biotin supplements of more than 5 mg per day, stop them at least 72 hours before collection.

Practical Tips Before Your Test

A few simple steps will help ensure an accurate result:

Avoid biotin-containing supplements for 12 to 72 hours before the test, depending on the dose
Tell your doctor about all medications and supplements you are currently taking
If you are having serial tests done over time, try to use the same laboratory each time, as results from different labs may not be directly comparable
Wear clothing with short or loose sleeves for easy access to your arm Israel

Step-by-Step Procedure

Here is what happens during your blood collection:

A trained phlebotomist cleans the skin on your inner arm with an antiseptic solution.
A small needle is inserted into a vein, usually in the crook of your elbow.
A small amount of blood is drawn into a collection tube.
The needle is removed, and gentle pressure is applied to stop any minor bleeding.
A small plaster may be placed on the site if needed.
The sample is labelled and sent to the laboratory for testing.

Factors That Can Affect Accuracy

Certain factors can influence your test result. These include:

Biotin (vitamin B7) supplementation, especially at high doses
Use of different laboratory methods or testing kits
Haemolysis (breakdown of red blood cells in the sample)
Lipemic (very fatty) blood samples
Rare antibody interference known as heterophile antibodies

Understanding Your CA 15-3 Test Results

Your results should always be reviewed alongside your full medical history by a qualified doctor. A single number means very little on its own; trends over time are far more informative.

Parameter	Normal	What a High Level May Suggest	What a Low or Normal Level May Suggest
CA 15-3	Less than 30 U/mL	Active or spreading disease; possible recurrence; response to treatment poor	No active disease, stable condition, or good treatment response

These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.

Results During Special Conditions

Certain non-cancerous conditions can raise CA 15-3 levels and should be considered when interpreting results:

Chronic hepatitis and liver cirrhosis can produce notable elevations in CA 15-3.
Conditions such as sarcoidosis, tuberculosis, and systemic lupus erythematosus may also raise levels above normal.
Pregnancy is a recognised factor that can increase CA 15-3 levels.
Endometriosis may also cause levels to be higher than the standard reference range.
High-dose biotin supplementation can cause falsely low or falsely high results depending on the testing platform used.

How to Maintain Healthy Levels

These general wellness tips support overall health during and after breast cancer treatment:

Follow the monitoring schedule recommended by your oncologist and attend all follow-up appointments.
Aim for balanced nutrition and light physical activity as tolerated, in consultation with your care team.
Keep a record of your serial CA 15-3 results over time so your doctor can spot trends quickly.

Lupin Diagnostics CA 15-3 Test Price and Home Collection

The CA 15-3 test price at Lupin Diagnostics starts at ₹640, and home collection is available across cities in India.

City	Approximate Price (₹)
Mumbai	₹1,250
Chennai	₹1,250
Hyderabad	₹1,250
Pune	₹1,250
Bangalore	₹1,250
Kolkata	₹1,250

Prices are indicative and may vary by location. Please confirm the current price at the time of booking.

How to Book

Select the test on the Lupin Diagnostics website.
Choose your city and preferred time slot.
Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
Receive your report via email or WhatsApp within the stipulated turnaround time.

Home Collection

Lupin Diagnostics offers home sample collection for the Cancer Antigen 15-3 test near me across multiple cities. All samples are processed in NABL-accredited laboratories staffed by trained professionals. Your digital report is delivered directly to your email or WhatsApp, making it easy to share with your doctor.

Frequently Asked Questions

No, this test is not recommended as a screening tool for early breast cancer detection. CA 15-3 levels are elevated in fewer than half of women with early-stage disease, and some breast cancers never raise levels at all. It is most useful for monitoring known diseases.

The frequency depends on your treatment stage. During active treatment, testing every one to three months is common. During the surveillance period after treatment, testing every three to six months is typical. Your oncologist will set the schedule that is right for you.

An elevated result does not automatically mean cancer is present or progressing. Raised levels can appear in benign conditions such as hepatitis, cirrhosis, and endometriosis, as well as in other types of cancer. Your doctor will interpret the result in the context of your full clinical picture.

Yes. Normal levels do not rule out breast cancer. CA 15-3 is elevated in fewer than half of early-stage cases. In addition, roughly 20% to 25% of people with advanced breast cancer have tumours that do not shed this marker into the blood.

Yes. While breast cancer is far less common in men, it does occur. Men diagnosed with breast cancer may have their CA 15-3 levels monitored in exactly the same way as women.

A single reading provides limited information. Tracking the CA 15-3 Breast Cancer Marker over multiple tests reveals trends. A rising level over time may suggest the cancer is progressing or returning, while a falling level often indicates a positive response to treatment.