What should the value of breast carbohydrate antigen 15-3 be?

The normal level of breast carbohydrate antigen CA15-3 should be 0–30 U/mL.

Breast carbohydrate antigen CA15-3 is commonly used to assess the presence of breast cancer, with a normal range of 0–30 U/mL. An elevated CA15-3 level may result from glycoprotein-specific antigens secreted by tumor cells. Patients can undergo blood tests to measure this marker, and the degree of elevation in CA15-3 levels can help determine the stage of breast cancer. In addition to diagnosis, CA15-3 levels are also monitored during cancer treatment to evaluate tumor burden, or after surgical removal of lesions to detect possible recurrence. However, various factors other than cancer—such as impaired immunity or renal insufficiency—can also increase CA15-3 levels. Therefore, this marker alone cannot confirm a tumor diagnosis, and further relevant examinations are necessary to identify the exact underlying cause.

Patients are advised to maintain a positive mindset after diagnosis, actively cooperate with treatment, and follow medical instructions regarding medication and care. Attention should be paid to a balanced diet; spicy, raw, cold, or otherwise irritating foods should be avoided. Excessive physical activity should be limited, and adequate warmth should be maintained to protect overall health.