Sepsis Screening Worksheet (SIRS, qSOFA, simplified SOFA)

About the Sepsis Screening Worksheet (SIRS, qSOFA, simplified SOFA)

Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. Early recognition and timely reassessment matter because delay is associated with worse outcomes.

The definition and screening of sepsis has evolved through three major iterations. **SIRS** (Systemic Inflammatory Response Syndrome) uses four simple bedside criteria (temperature, heart rate, respiratory rate, WBC count) — meeting 2 or more suggests systemic inflammation. While highly sensitive, SIRS is non-specific and can be positive in many non-infectious conditions. The **Sepsis-3** definition refined the concept: sepsis is defined in that framework as a suspected or documented infection with an acute increase in **SOFA score ≥ 2**, reflecting organ dysfunction rather than inflammation alone.

For bedside screening, **qSOFA** (quick SOFA) uses just three clinical parameters — systolic BP ≤ 100, respiratory rate ≥ 22, and altered mentation (GCS < 15). A qSOFA ≥ 2 adds context for closer assessment of organ dysfunction. This page provides simultaneous SIRS, qSOFA, and a simplified SOFA-style organ-dysfunction worksheet for educational screening and severity framing. It does not reproduce every ICU-grade SOFA input, so it should be read as context rather than as a formal bedside sepsis protocol.

When This Page Helps

Sepsis screening is strongest when the bedside criteria and organ-dysfunction data are read together instead of in isolation. This calculator puts SIRS, qSOFA, and SOFA on one page so you can see whether a patient merely meets inflammatory criteria, has bedside signs of higher risk, or already shows organ dysfunction that fits the Sepsis-3 framework.

How to Use the Inputs

1. Enter vital signs: temperature, heart rate, respiratory rate, WBC, systolic BP, and GCS.
2. Enter organ function labs: lactate, creatinine, platelets, bilirubin, PaO₂, and FiO₂.
3. Use clinical presets for non-sepsis, SIRS, sepsis, and septic shock scenarios.
4. Review all three scores: SIRS criteria, qSOFA, and full SOFA with organ-level breakdown.
5. The classification integrates all scores with septic shock context.
6. Reference the SOFA scoring table for organ-specific point assignment.

Example Calculation

Tips & Best Practices

• Time still matters in sepsis, but bedside management should follow the full clinical picture and local workflows rather than the calculator alone.
• Lactate trends are often used to add context when hypoperfusion is a concern.
• qSOFA is most useful outside the ICU — in the ED or on the wards — for early detection.
• A single SOFA score is less useful than the trend (ΔSOFA) — baseline organ function matters.
• Procalcitonin (PCT) can help distinguish bacterial from viral infection, but it should be read in context and not overrule bedside assessment.

Why the Three Scores Coexist

SIRS is sensitive and easy to trigger, which makes it useful for broad screening but weak for specificity. qSOFA is a fast bedside warning tool that highlights patients who may deteriorate outside the ICU. SOFA is more detailed and ties the diagnosis to measurable organ dysfunction. Looking at them together helps separate simple inflammatory response from clinically important sepsis risk.

Where Interpretation Can Drift

A positive SIRS result does not prove sepsis, and a negative qSOFA does not safely exclude it. Patients can have infection-related organ dysfunction before the bedside score becomes striking, especially early in the course or after partial treatment. That is why lactate, blood pressure trends, renal function, platelet count, and mental status still matter even when one score looks reassuring.

Use the Score as Context, Not a Checklist

The practical value of the calculator is in organizing severity signals that often prompt closer review and serial reassessment. A rising SOFA trend, persistent hypotension, or worsening lactate carries more weight than any isolated snapshot, so the scores should support clinical evaluation rather than substitute for bedside review.

Frequently Asked Questions

• What is the difference between SIRS and sepsis?

  SIRS is the systemic inflammatory response (non-specific — can be from surgery, burns, pancreatitis). Sepsis requires suspected or confirmed infection PLUS organ dysfunction (SOFA ≥ 2).

• When should I use qSOFA vs SOFA?

  qSOFA is a bedside screening tool (3 criteria, no labs needed). If qSOFA ≥ 2, perform full SOFA assessment. SOFA requires lab values and is more comprehensive for ICU patients.

• Why doesn't this page give sepsis bundle instructions?

  Because bundle steps depend on infection source, hemodynamics, comorbidities, access, repeat labs, and the workflow being used locally. This page stays on score interpretation and severity framing rather than turning the calculator into a bedside workflow guide.

• How is septic shock defined?

  Sepsis-3 defines septic shock as sepsis with vasopressor-dependent hypotension and lactate > 2 mmol/L despite fluid resuscitation. This page uses that definition as severity context rather than as a treatment pathway.

• Can a patient have sepsis with a normal WBC?

  Yes. Up to 20% of sepsis patients have normal WBC counts. Bandemia (> 10% bands) or immunosuppression can cause sepsis without leukocytosis. Use qSOFA and SOFA regardless of WBC.

• What is the significance of lactate > 2?

  Lactate > 2 mmol/L can add context for hypoperfusion risk and is associated with worse outcomes. Serial lactate trends are often reviewed alongside blood pressure, urine output, and overall clinical trajectory rather than in isolation.