CA125 is a tumor marker primarily used for ovarian cancer, but it can also be elevated in other conditions. A normal CA125 level is typically less than 35 units per milliliter (U/mL). However, an elevated CA125 level does not necessarily mean cancer is present. In general, a level above 35 U/mL is considered higher than normal, but it is important to note that many non-cancerous conditions can cause CA125 levels to rise. Further diagnostic tests, such as imaging and biopsies, are needed to determine the cause of the elevated CA125 and confirm the presence of cancer.