How this calculator works
Each positive bedside criterion contributes one point. Two or more identify a group at increased risk of poor outcomes with suspected infection. A lower result does not exclude sepsis. The consensus task force used GCS below 15 for altered mentation; do not substitute the derivation model's narrower mental-status threshold. The result is an estimate for information only and is not medical advice.
Formula
qSOFA = I(GCS < 15) + I(respiratory rate >= 22/min) + I(systolic blood pressure <= 100 mmHg). I is 1 when true and 0 otherwise.
Worked example
GCS 14, respiratory rate 22 and systolic pressure 100 mmHg meet all three criteria, giving 3. GCS 15, rate 18 and pressure 120 give 0.
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Frequently asked questions
Does exactly 100 mmHg score a point?
Yes. The blood pressure comparison includes 100, and the respiratory comparison includes 22.
Can a score of zero rule out sepsis?
No. Use the whole clinical assessment. qSOFA does not replace assessment of organ dysfunction.
Can I infer vital signs from a total?
No. Many combinations produce the same score, and a positive criterion represents a range rather than one measurement.