Sepsis Risk Calculator

Patient Inputs

Large screens show three columns, smaller screens two, and mobile one.

Age (years)

Temperature (°C)

Heart Rate (/min)

Respiratory Rate (/min)

Systolic BP (mmHg)

Diastolic BP (mmHg)

SpO₂ (%)

WBC (×10³/µL)

Lactate (mmol/L)

Glasgow Coma Scale

Urine Output (mL/hr)

Body Weight (kg)

PaCO₂ (mmHg) Optional

Bands (%) Optional

Suspected Infection

Immunosuppressed

Comorbidity Burden

Reset

Formula Used

This page combines bedside screening elements into one weighted score:

Weighted Screening Score = (2 × qSOFA) + SIRS + Perfusion Points + Host Context Points

qSOFA

qSOFA = [Respiratory Rate ≥ 22] + [SBP ≤ 100] + [GCS < 15]

Each positive item adds 1 point. The qSOFA subtotal is doubled to increase bedside weighting.

SIRS

SIRS = [Temp > 38 or < 36] + [HR > 90] + [RR > 20 or PaCO₂ < 32] + [WBC > 12 or < 4 or Bands > 10]

Each positive item adds 1 point.

Perfusion Points

Perfusion = Lactate + MAP + SpO₂ + Urine Output points

Lactate 2.0–3.9 = 2 points
Lactate ≥ 4.0 = 4 points
MAP < 65 = 2 points
SpO₂ < 92% = 1 point
Urine output < 0.5 mL/kg/hr = 2 points

Host Context Points

Suspected infection = 2 points
Age ≥ 65 = 1 point
Immunosuppressed = 1 point
Comorbidity burden = 0 to 2 points

Risk Bands

0–5 Low | 6–10 Guarded | 11–15 High | 16–25 Critical

How to Use This Calculator

Enter adult patient vitals, blood pressure, oxygen saturation, and core laboratory values.
Add GCS, urine output, and weight so the tool can estimate neurologic and perfusion stress.
Mark suspected infection, immunosuppression, and comorbidity burden.
Press the calculate button to display the weighted result above the form.
Review qSOFA, SIRS, perfusion, host context, graph output, and export files.
Use the result as a screening summary, not as a diagnosis or treatment order.

Example Data Table

Case	Age	Temp	HR	RR	BP	SpO₂	WBC	Lactate	GCS	Urine mL/kg/hr	Total Score	Band
Example A	34	37.4°C	82	18	122/78	97%	8.4	1.1	15	1.00	2	Low
Example B	57	39.1°C	96	21	110/68	91%	13.1	2.1	15	0.50	11	High
Example C	68	38.6°C	108	24	98/60	93%	14.2	2.6	14	0.44	18	Critical

FAQs

1. Is this a diagnostic sepsis tool?

No. It is an educational screening calculator that summarizes bedside concern. Diagnosis and treatment still require clinical assessment, protocols, and real-time patient context.

2. Why does qSOFA receive extra weight?

The calculator doubles qSOFA so bedside instability carries more influence. This is a design choice for screening emphasis, not a published replacement for official scoring systems.

3. Why include both qSOFA and SIRS?

They capture different patterns. qSOFA focuses on bedside deterioration, while SIRS captures inflammatory abnormalities. Showing both helps users review signals side by side.

4. What does the lactate field do?

Higher lactate raises perfusion points. The calculator adds 2 points from 2.0 to 3.9 mmol/L and 4 points at 4.0 mmol/L or above.

5. Why do I need urine output and body weight?

The page converts urine output into mL/kg/hr. Low urine flow can suggest poor perfusion, so values below 0.5 mL/kg/hr add extra concern points.

6. Can this page classify septic shock?

No. Septic shock requires broader clinical confirmation and treatment context. This calculator only highlights worsening screening features and perfusion stress.

7. Is this appropriate for children?

No. Pediatric sepsis assessment differs from adult screening. This page is written for adult educational use only.

8. What should users do with a critical result?

Treat it as a prompt for urgent clinical evaluation. Do not rely on the calculator alone when severe symptoms or rapid deterioration are present.