The Ambulatory Severity Index is a method to better quantitate the total complexity of an ambulatory visit.
NOTE: The exact details of the index are sketchy in the original article (Horn et al, 1988). I hope to find additional references to clarify this.
Diagnoses and Problems
All diagnoses and problems addressed at the visit are graded based on their seriousness.
none or mild
warrants no intervention
action may be taken
requires workup (and resource utilization)
consider hospital admission
Each item of level 2 or higher is squared, giving greater weight to items which are more serious.
Biological and biophysical factors
(3) social situation
(4) physical functioning
(5) psychological functioning
problems but not interfering with implementation of treatment
problems interfering with implementation of treatment
lack of ability to function independently
The final score is given as a single number called the S^4 score (the signs and symbols, sum of squares).
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Purpose: To measure the seriousness of a patient encounter in the ambulatory care setting using the Ambulatory Severity Index (ASI).
Objective: severity, prognosis, stage, disease progression, economic cost