Average Length of Stay (ALOS)
The mean number of days patients spend admitted to a facility, found by dividing total inpatient-days by the number of discharges. ALOS gauges efficiency and resource use; ambulatory surgery centers contrast sharply with their same-day discharge model.
What is Average Length of Stay (ALOS)?
Average Length of Stay (ALOS) is the mean number of days that patients remain admitted to a facility. It is calculated by dividing the total inpatient-days over a period by the number of patients discharged during that period.
By condensing many individual stays into a single average, ALOS provides a high-level read on how long patients typically occupy a bed. It is most relevant where patients are admitted and discharged over a span of days.
Why does ALOS matter, and how do ASCs compare?
ALOS is widely used as a gauge of efficiency and resource use, since shorter stays generally mean lower cost per case and faster bed turnover, provided quality is maintained. It helps facilities understand and manage how care duration drives capacity and expense.
Ambulatory surgery centers stand in sharp contrast to this measure because they are built around same-day discharge, with patients going home the day of their procedure. Their model effectively sidesteps the inpatient length-of-stay dynamic that ALOS captures.
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