Length of Stay (LOS) is the total number of days a patient spends in a hospital or healthcare facility. LOS is often used by doctors, hospitals, and insurers to measure how long patients need care and to track efficiency. In medicine, it helps evaluate patient outcomes, costs, and the quality of healthcare services.
Source
Interventions To Decrease Hospital Length of Stay. PubMed. https://www.ncbi.nlm.nih.gov/books/NBK574438/