The crossword solution for the term 'Hospital Fluid' is 'SERUM'. SERUM is a clear, pale yellow liquid that is a component of blood. It is made up of proteins, antibodies, and other substances that help the body fight infection and disease. SERUM is used in hospitals to treat a variety of medical conditions, including dehydration, shock, and burns. It can also be used to diagnose certain diseases and to monitor the progress of treatments.