Table 1

Modified Marshall scoring system for organ dysfunction

	Score
Organ system	0	1	2	3	4
Respiratory (PaO₂/FiO₂)	>400	301–400	201–300	101–200	≤101
Renal*
(serum creatinine, µmol/l)	≤134	134–169	170–310	311–439	>439
(serum creatinine, mg/dl)	<1.4	1.4–1.8	1.9–3.6	3.6–4.9	>4.9
Cardiovascular (systolic blood pressure, mm Hg)†	>90	<90, fluid responsive	<90, not fluid responsive	<90, pH<7.3	<90, pH<7.2
For non-ventilated patients, the FiO₂ can be estimated from below:
Supplemental oxygen (l/min)	FiO₂ (%)
Room air	21
2	25
4	30
6–8	40
9–10	50

A score of 2 or more in any system defines the presence of organ failure.
*A score for patients with pre-existing chronic renal failure depends on the extent of further deterioration of baseline renal function. No formal correction exists for a baseline serum creatinine ≥134 μmol/l or ≥1.4 mg/dl.
†Off inotropic support.