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PICU Severity

PICU Severity: 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.

PICU Severity

Systolic BP at admissionmmHg
Both pupils >3 mm and fixed to light (1 = yes)
Mechanical ventilation in the first ICU hour (1 = yes)
Elective ICU admission (1 = yes)
Base excess (BE)mmol/L
PaO₂ and FiO₂ measured (1 = yes)
FiO₂%
PaO₂mmHg
Recovery from procedure: 0 none, 1 cardiac bypass, 2 cardiac non-bypass, 3 non-cardiac
Risk diagnosis: 0 none, 1 low, 2 high, 3 very high
Probability of death (PIM3)
1.22%
PIM3 (Straney 2013) — the model chosen for paediatric ICU severityVery high risk: cardiac arrest before admission, SCID, leukaemia/lymphoma after first induction, bone marrow transplant recipient, liver failureHigh risk: spontaneous cerebral haemorrhage, cardiomyopathy or myocarditis, HLHS, neurodegenerative disorder, NECLow risk (main reason for admission): asthma, bronchiolitis, croup, obstructive sleep apnoea, diabetic ketoacidosis, seizure disorderIn cardiac arrest record SBP = 0; in shock with unmeasurable BP record 30Reference calculation; the decision rests with the physicianPICU Severity: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
PIM3 logit
-4.397
FiO₂×100/PaO₂
0.23

More about: PICU Severity

What it calculates

The “PICU Severity” calculator computes Probability of death (PIM3) in % from 10 parameters: systolic bp at admission (mmHg), both pupils >3 mm and fixed to light (1 = yes), mechanical ventilation in the first icu hour (1 = yes), elective icu admission (1 = yes), base excess (be) (mmol/L), pao₂ and fio₂ measured (1 = yes), fio₂ (%), pao₂ (mmHg), recovery from procedure: 0 none, 1 cardiac bypass, 2 cardiac non-bypass, 3 non-cardiac, risk diagnosis: 0 none, 1 low, 2 high, 3 very high.

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Systolic BP at admission = 120 mmHg, Both pupils >3 mm and fixed to light (1 = yes) = 0, Mechanical ventilation in the first ICU hour (1 = yes) = 0, Elective ICU admission (1 = yes) = 0, Base excess (BE) = 0 mmol/L, PaO₂ and FiO₂ measured (1 = yes) = 0, FiO₂ = 21 %, PaO₂ = 90 mmHg, Recovery from procedure: 0 none, 1 cardiac bypass, 2 cardiac non-bypass, 3 non-cardiac = 0, Risk diagnosis: 0 none, 1 low, 2 high, 3 very high = 0 the result is 1.22 % (PIM3 (Straney 2013) — the model chosen for paediatric ICU severity).

How to use

  1. Enter systolic bp at admission, both pupils >3 mm and fixed to light (1 = yes), mechanical ventilation in the first icu hour (1 = yes), elective icu admission (1 = yes), base excess (be), pao₂ and fio₂ measured (1 = yes), fio₂, pao₂, recovery from procedure: 0 none, 1 cardiac bypass, 2 cardiac non-bypass, 3 non-cardiac and risk diagnosis: 0 none, 1 low, 2 high, 3 very high — each field above is adjustable with a slider.
  2. Probability of death (PIM3) (%) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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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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