Average Length of Stay (ALOS)
Mean number of days a patient stays in the hospital or facility
FORMULA
ALOS = Total Patient Days / Number of Discharges
Alternate Calculations
By Unit
Unit Patient Days / Unit DischargesWhat is Average Length of Stay?
Average Length of Stay (ALOS) measures the mean number of days patients remain in a hospital or healthcare facility. A key operational metric for capacity planning and efficiency analysis. Shorter ALOS typically indicates better discharge planning and efficiency, though clinical appropriateness is critical.
Calculated as total inpatient days divided by number of discharges. Used for benchmarking and operational planning.
Chart
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Sample Data
| month | days | discharges | alos | benchmark |
|---|---|---|---|---|
| Jan | 2,850 | 285 | 10 | 9.2 |
| Feb | 2,680 | 295 | 9.1 | 9.2 |
| Mar | 2,745 | 315 | 8.7 | 9.2 |
| Apr | 2,610 | 330 | 7.9 | 9.2 |
| May | 2,520 | 340 | 7.4 | 9.2 |
| Jun | 2,430 | 350 | 6.9 | 9.2 |
Required Data Columns
total_daysdischargesunit