CEA test: Carcinoembryonic antigen test is to detect response to therapy in cancer patients, especially colon cancer, with normal range of less than 2.5 (less than 5 in heavy smokers). Note that a positive test may not always be indicative of cancer.
Os Trigonum Syndrome. An Os Trigonum is a small, extra bone found at the back of the ankle in approximately 5-10% of people. Often it goes completely unnoticed, not causing any problems.
Classical education uses a teaching method called the trivium, a three-part process of grammar, logic and rhetoric stages. The Gazette-Enterprise: News There Alcuin taught the seven sciences of the trivium and quadrivium, i.e. grammar, rhetoric, and logic, arithmetic, music, geometry, and astronomy.