Pneumonia Severity Index

Pneumonia Severity Index: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Pneumonia Severity Index

Ageyears

Male sex (1 = yes)

Nursing home resident (1 = yes)

Neoplastic disease (1 = yes)

Liver disease (1 = yes)

Congestive heart failure (1 = yes)

Cerebrovascular disease (1 = yes)

Renal disease (1 = yes)

Altered mental status (1 = yes)

Respiratory rate/min

Systolic BPmmHg

Body temperature°C

Heart ratebpm

Arterial pH

Blood ureammol/L

Sodiummmol/L

Glucosemmol/L

Hematocrit%

PaO₂mmHg

Pleural effusion (1 = yes)

PSI points

60points

Class I is assigned without point scoringSpO₂ <90% may replace PaO₂ <60Pneumonia Severity Index: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

Risk class

30-day mortality

0.6–0.7%

Management

Outpatient treatment

What it shows

Health, fitness and clinical calculators with standard formulas — body composition, calories, blood pressure, lipid panels, cardiac scores (CHA₂DS₂-VASc, HEART, TIMI), kidney/liver function (MELD, Child-Pugh), pregnancy and more.

Formula & example

The calculator computes PSI points (points) from parameters:

Age (years)
Male sex (1 = yes)
Nursing home resident (1 = yes)
Cancer (1 = yes)
Hepatic disease (1 = yes)
Congestive heart failure (1 = yes)
Cerebrovascular disease (1 = yes)
Renal disease (1 = yes)
Altered mental status (1 = yes)
Respiratory rate (/min)
Systolic BP (mmHg)
Body temperature (°C)
Pulse (bpm)
Arterial blood pH
Blood urea (mmol/L)
Sodium (mmol/L)
Glucose (mmol/L)
Hematocrit (%)
PaO₂ (mmHg)
Pleural effusion (1 = yes)

Example 1

Age = 60 years, Male sex (1 = yes) = 1, Nursing home resident (1 = yes) = 0, Cancer (1 = yes) = 0, Hepatic disease (1 = yes) = 0, Congestive heart failure (1 = yes) = 0, Cerebrovascular disease (1 = yes) = 0, Renal disease (1 = yes) = 0, Altered mental status (1 = yes) = 0, Respiratory rate = 18 /min, Systolic BP = 125 mmHg, Body temperature = 37.5 °C, Pulse = 90 bpm, Arterial blood pH = 7.4, Blood urea = 6 mmol/L, Sodium = 140 mmol/L, Glucose = 6 mmol/L, Hematocrit = 40 %, PaO₂ = 80 mmHg, Pleural effusion (1 = yes) = 0

→ PSI points: 60 points

Example 2 (×1.5)

Age = 90 years, Male sex (1 = yes) = 1.5, Nursing home resident (1 = yes) = 0, Cancer (1 = yes) = 0, Hepatic disease (1 = yes) = 0, Congestive heart failure (1 = yes) = 0, Cerebrovascular disease (1 = yes) = 0, Renal disease (1 = yes) = 0, Altered mental status (1 = yes) = 0, Respiratory rate = 27 /min, Systolic BP = 187.5 mmHg, Body temperature = 56.25 °C, Pulse = 135 bpm, Arterial blood pH = 11.1, Blood urea = 9 mmol/L, Sodium = 210 mmol/L, Glucose = 9 mmol/L, Hematocrit = 60 %, PaO₂ = 120 mmHg, Pleural effusion (1 = yes) = 0

→ PSI points: 115 points

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FAQ

How is BMI calculated?

BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.

Is BMI accurate for everyone?

No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.

What are the BMI categories?

Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.

What is a better measure than BMI?

Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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Pneumonia Severity Index