What does the abbreviation "CA" typically denote in the medical field?

In the medical field, the abbreviation "CA" commonly stands for "cancer." This term is frequently used in various medical contexts, particularly in oncology, which is the study and treatment of tumors. "CA" can also appear as part of specific cancer-related terms, such as "CA-125," which is a blood test used to monitor certain types of cancer, particularly ovarian cancer. Understanding this abbreviation is critical for healthcare professionals when communicating about diagnosis, treatment plans, and patient management related to cancer. The other options—cell, prognosis, and diagnosis—do not have a standard association with the abbreviation "CA" in medical terminology, making cancer the accurate interpretation.