Blood tests can detect various biomarkers and substances that are often elevated in cancer patients. For instance, a Complete Blood Count (CBC) can reveal abnormalities in the levels of red blood cells, white blood cells, and platelets. Elevated levels of certain proteins, such as CA-125, PSA, and CEA, can also be indicative of specific types of cancer. These markers, known as tumor markers, are substances produced by cancer cells or by the body in response to cancer.
