calculator sepsis

What is sepsis?

Sepsis is a life-threatening organ dysfunction caused by a dysregulated response to infection. In plain language, the body’s response to infection becomes harmful and can damage tissues and organs. Early recognition and treatment are strongly associated with better outcomes.

How this sepsis calculator works

This page combines two common bedside screening frameworks:

• qSOFA (quick Sequential Organ Failure Assessment): simple bedside risk screen.
• SIRS criteria (Systemic Inflammatory Response Syndrome): broader physiologic inflammation screen.

It also includes optional lactate, because elevated lactate can signal poor tissue perfusion and more severe illness. The output provides a practical interpretation, not a diagnosis.

qSOFA components

• Respiratory rate ≥ 22/min
• Systolic blood pressure ≤ 100 mmHg
• Altered mentation (GCS < 15)

Each positive criterion scores 1 point. A qSOFA score of 2 or more suggests higher risk and the need for urgent clinical evaluation.

SIRS components

• Temperature > 38°C or < 36°C
• Heart rate > 90/min
• Respiratory rate > 20/min
• White blood cell count > 12 or < 4 x10⁹/L

SIRS is sensitive but less specific. It may be positive in conditions other than infection, which is why context matters.

How to interpret results responsibly

Use the calculator as a screening prompt. A high result means urgent review is needed, not that diagnosis is finalized. A lower result does not fully exclude sepsis, especially in very young, older, immunocompromised, or clinically unstable patients.

Practical interpretation guide

• High concern: qSOFA ≥ 2 and/or lactate ≥ 4 mmol/L.
• Moderate concern: qSOFA 1, or SIRS ≥ 2 with lactate elevation.
• Lower concern: criteria mostly negative and patient clinically stable.

Why suspected infection matters

Sepsis requires infection plus organ dysfunction. If infection is not suspected, abnormal vitals may still represent serious illness (e.g., hemorrhage, pulmonary embolism, metabolic crisis), but sepsis-specific scoring becomes less meaningful.

Limitations of any sepsis calculator

• No score replaces clinician judgment or full examination.
• Single time-point values may miss dynamic deterioration.
• Different settings use different pathways (ED, ICU, prehospital, ward).
• Laboratory and imaging context can materially change risk.

When to seek emergency help now

Call emergency services immediately for severe shortness of breath, persistent low blood pressure, new confusion, cyanosis, severe lethargy, inability to stay awake, or rapidly worsening symptoms. In suspected sepsis, delayed treatment can increase risk of complications.

Bottom line

This calculator is useful for quick bedside structure: gather key vitals, estimate risk, and accelerate escalation when needed. Use it to support—not replace—timely medical assessment, diagnostics, and treatment protocols.