IGS II / SAPS II
Initial ICU severity · First 24 h collection.
IGS II / SAPS II
Principle
First 24 h severity index:17 variables grouped into 15 scored items, total 0–163.
Scope
Original 1993 model, historical calibration not suited to a current individual decision. Adults in intensive care; not validated in paediatrics, burns, coronary units or cardiac surgery. Determines neither admission, care limitation nor treatment. No imputation of missing data.
Interpretation limits
Original 1993 model, historical calibration not suited to a current individual decision. Adults in intensive care; not validated in paediatrics, burns, coronary units or cardiac surgery. Determines neither admission, care limitation nor treatment. No imputation of missing data.
Formula and logic
Sum of 15 scored items; chronic diseases not accumulated. PaO₂/FiO₂: PaO₂ ÷ FiO₂ fraction. Urine output 24 h: volume×24/duration; thresholds compared before rounding.
Definition version : 0.1.0
Sources
- Le Gall, Lemeshow, Saulnier · JAMA — SAPS II · Étude multicentrique originale
1993 · 17 original variables and population exclusions; original abstract accessed, full article unavailable.
- JAMA — Errors in Tables · Correction du SAPS II
1994 · CPAP means continuous positive airway pressure; urea 0,60–1,79 g/L, not 6,0–1,79.
- Monti et al. · Critical Care Medicine — PPI-SEPSIS · Supplément, tableau S 2, pages 13–14
2025 · Reproduction of the original scoring system; urea 10–29,6 is a typo excluded by cross-checking 10–29,9. Variables and ratings, no treatment rule.
- DHOS · AP-HP — Annexe I · IGS II, circulaire 2003-413
2003 · Collection rules, extrapolated urine output, presedation GCS, bilirubin with jaundice. Intercept −7,7331 and maximum 194 not adopted.
- Le Gall et al. · Critical Care — Mortality prediction using SAPS II: an update for French ICUs
2005 · Explicit reuse of the original 1993 model: −7,7631 +0,0737×S +0,9971×ln(S+1). No 2005 recalibration coefficient used.
- SwissScoring · Swiss Medical Weekly — SwissScoring — a nationwide survey of SAPS II assessing practices and its accuracy
2014 · 15 calculated items, maximum 163; calibration limitations of original probabilities.
- PLOS ONE · Étude de validation — External validation of SAPS II · Table 2
2016 · Examples of published original probabilities for scores 10 to 100; no invented risk thresholds.