Why is a CA 15.3 tumor marker blood test done?
A blood test is not recommended for diagnosing the presence of breast cancer. It is advised for monitoring the extent of development and severity of certain cancers like breast cancer.
But the CA 15.3 blood test is not restricted to monitoring breast cancer only. It can track the growth of other malignant disorders and also non-malignant conditions. However, the test results may not be conclusive about the presence of breast cancer. Advanced breast cancer may have tumors that do not make CA 15.3.
There are no separate preparations that need to be undertaken before taking the test. There are certain blood tests that may require patients to keep a complete or partial fast for a certain number of hours before undergoing the tests. A partial fast requires avoiding food, while a complete fast implies abstaining from food and water.
The duration of fast may vary between 6 to 12 hours approximately. However, these regulations are not applicable for the CA 15.3 tumor marker blood test, unless your doctor recommends otherwise.
It is essential for you to discuss with your doctor the medications that you may be taking now or have taken in the recent past. Such medications include prescription drugs, non-prescription or OTC (over-the-counter) drugs, vitamins, supplements, and herbals.
Make sure to carry your medical documents for the doctor to thoroughly check the prescription drugs that you might be taking now. This will enable him/her to analyze whether any of these medications have a known history of interacting with this blood test result. He/she will then be able to advise you accordingly.
Also, let your doctor know about any recognized history of allergies that you may have. This will help your doctor in evaluating whether this test may trigger the symptoms of allergies in you.