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.
Osmium tetroxide (also osmium(VIII) oxide) is the chemical compound with the formula OsO 4. The compound is noteworthy for its many uses, despite the rarity of osmium.It also has a number of interesting properties, one being that the solid is volatile.The compound is colourless, but most samples appear yellow.smium tetroxide (also osmium(VIII) oxide) is the chemical compound with the formula OsO 4. The compound is noteworthy for its many uses, despite the rarity of osmium.