APACHE II / SOFA Score Calculator

Calculate SOFA organ dysfunction score and an APACHE II style severity total.

About APACHE II / SOFA Score Calculator

SOFA describes concurrent organ dysfunction and is most informative as a trend over days rather than as a single value. Rising SOFA scores predict outcome better than the admission value alone. These scores were developed for cohort comparison rather than individual prognosis, and applying population mortality to one patient is a recognised misuse.

Formula

APACHE II / SOFA Score

SOFA sums six organ systems scored 0 to 4 each, giving 0 to 24

SOFA: Sequential organ failure assessment, six systems scored 0 to 4
APACHE II: Adds age and chronic health points to a physiology score

Worked example

With the default values below, APACHE II / SOFA Score Calculator returns SOFA Score of 9. Change any input above and every figure here is recalculated in your browser.

Inputs used

Respiration componentaccepts 0–4: 2
Coagulation componentaccepts 0–4: 1
Liver componentaccepts 0–4: 1
Cardiovascular componentaccepts 0–4: 2
Central nervous system componentaccepts 0–4: 1
Renal componentaccepts 0–4: 2
APACHE II age pointsaccepts 0–6: 3
APACHE II chronic health pointsaccepts 0–5: 2

Results

SOFA Score: 9 /24
Published Mortality Associated With That SOFA Score: 33.3%
APACHE II Style Total: 14
Organ Systems Scoring 3 or More: 0
Worst Affected System: Respiration

Step by step

1Values used
2APACHE II / SOFA Score
3SOFA Score= 9 /24
4Published Mortality Associated With That SOFA Score= 33.3
5APACHE II Style Total= 14
6Organ Systems Scoring 3 or More= 0
7Worst Affected System= Respiration

Assumptions and limits

The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
This reproduces a published formula for educational and reference use only. It is not a diagnostic tool, does not account for individual clinical context, and must not be used to make or change treatment decisions. Clinical assessment by a qualified healthcare professional is always required. These are intensive care research and audit instruments requiring detailed physiological data. They are not intended for individual prognostication or for use outside critical care by non-specialists.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This reproduces a published formula for educational and reference use only. It is not a diagnostic tool, does not account for individual clinical context, and must not be used to make or change treatment decisions. Clinical assessment by a qualified healthcare professional is always required. These are intensive care research and audit instruments requiring detailed physiological data. They are not intended for individual prognostication or for use outside critical care by non-specialists.

Frequently Asked Questions

How is APACHE II / SOFA Score calculated?

SOFA sums six organ systems scored 0 to 4 each, giving 0 to 24 SOFA describes concurrent organ dysfunction and is most informative as a trend over days rather than as a single value. Rising SOFA scores predict outcome better than the admission value alone.

Why does APACHE II / SOFA Score matter?

These scores were developed for cohort comparison rather than individual prognosis, and applying population mortality to one patient is a recognised misuse.

What values do I need to enter?

This calculator takes 8 inputs: Respiration component, Coagulation component, Liver component, Cardiovascular component, Central nervous system component, Renal component, APACHE II age points, APACHE II chronic health points. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.