use cases

Predict Hospitalization Length of Stay

Use patient intake data to predict the length of stay at hospitalization.


Annually, U.S. hospitals account for over 35.7 million stays, costing more than $415 billion (1). With an average stay of 4.6 days, there is a significant opportunity to reduce healthcare costs and improve patient outcomes by safely shortening the length of stay. Prolonged hospitalization increases the risk of hospital-acquired conditions, strains healthcare resources, and affects the hospital’s capacity to admit new patients. Efficiently managing and reducing unnecessary extended stays is crucial for enhancing operational efficiency and patient care in healthcare settings. Delays in discharge often lead to prolonged LOS and create clinical and operational burdens on providers. As long as patients continue to occupy beds while awaiting discharge, clinical personnel must attend to them, reducing the amount of time they can spend with other patients that may require more intensive care. This leads to greater scarcity of beds and delays operational processes, such as sanitizing rooms and medical equipment before subsequent use.

Further, extended LOS can increase risk for HACs in more vulnerable patients, and may also result in “access block”—a situation in which patients requiring admission are forced to wait for more than eight hours in the emergency department due to lack of available inpatient beds (2). Access block occurs for approximately 8% of patients and perpetuates extended LOS; it is associated with nearly a day of increased LOS on average. The impact of prolonged LOS on health outcomes is especially pronounced in the ICU setting and is associated with greater incidence of adverse events for vulnerable patients, such as older adults. Elderly ICU patients generally require more resource-intensive treatment, and roughly 55% that experience a prolonged LOS die within six months of discharge (3). These patients also incur approximately seven times the cost of patients that do not experience a prolonged LOS (3).

Why it matters

  • More than $415 billion is attributed to hospital stays annually.
  • Over 35.7 million hospital stays occur annually in the U.S.
  • $11,700 is the average cost of an inpatient stay in the U.S.
  • The average length of stay (LOS) is 4.6 days.
  • 7x increased cost is attributed to prolonged LOS for elderly ICU patients compared to those that do not have extended LOS.
  • Elderly ICU patients with prolonged LOS face a greater incidence of adverse events and increased mortality rates.


A predictive model using synthetic data, "StayOptim AI", has been developed to evaluate patients' LOS based on a multitude of clinical and demographic data. This predicts LOS more accurately, improving healthcare facilities' ability to optimize care coordination and improve resource management.

User person:  Hospital Administrators, Healthcare Policy Makers, Patient Advocacy Group Leaders, Doctors.

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The synthetic data set simulating patient admissions was constructed using insights from medical studies and healthcare analytics. Resources such as the statistical report by Freeman et al. (1) provide an overview of variations in hospital stay, while Bashkin et al. (2) examine organizational factors that affect LOS, and Abd-Elrazek et al. (3) contribute predictions based on general admission characteristics. These enabled the selection of model variables and ensured realistic prediction capabilities.


  1. Freeman, William, et al. “Statistical Brief 4246: Overview of U.S. Hospital Stays in 2016: Variation by Geographic Region” Agency for Healthcare Research and Quality: Healthcare Cost and Utilization Project, Dec. 2018, https.//www.hcup-
  2. Bashkin, Osnat, et al. “Organizational Factors Affecting Length of Stay in the Emergency Department: Initial Observational Study” Israel Journal of Health Policy Research, vol. 4, no. 38, 15 Oct. 2015, DOI: Accessed 29 Jun. 2021.
  3. Abd-Elrazek, Merhan A., et al. “Predicting Length of Stay in Hospitals Intensive Care Unit Using General Admission Features” Ain Shams Engineering Journal, 20 Apr. 2021, DOI:]/021.02.018. Accessed 29 Jun. 2021.

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