LIS refers to Library Information Services, or Laboratory Information Services or System. In a Library Information Services position, you handle responsibilities related to assisting patrons in a library. You may find books for customers, answer questions, or help with research. You can work as a page, library assistant or technician, librarian, or library manager. In a laboratory Information Service or System job, your duties involve clinical research. You work with a procedure designed to store, process, and test specimen in a lab. There are positions as a scientist, a research assistant, an analyst, and a supervisor.