There are a few things that patients need to do before having the test done. Certain blood tests 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.
Understanding the Results
Your test results depend on several factors like your age, gender, medical history, test method, and other aspects. It is necessary to talk to your doctor about your test results, rather than self-diagnosing your condition. Your doctor is the best person to make you understand what your result means.
Negative or normal result: Cancer antigen 15-3 of less than or equal to 30 units per milliliter (U/mL) is considered to be the normal range. This is referred to as a negative result, indicating the absence of malignant or non-malignant growth.