The image is a page from a book or document, specifically page 3. The text on this page appears to be in Vietnamese and discusses "3. Trường hợp xác định." This translates to "3. Identification of cases" in English. The page contains several bullet points or sections, each with a numbered item and some text. The layout includes a header, a main body, and a footer. The content seems to be related to medical or diagnostic procedures, possibly for identifying specific cases or conditions.