What is the APACHE II Score used for?

The APACHE II Score helps clinicians apply the Disease Severity framework within Critical Care. Use the inputs on this page to compute the published score or result, then interpret it alongside history, examination, and other tests—not as a replacement for judgment.

Are results from this tool medical advice?

No. YMed Atlas calculators are educational and workflow supports. Validation, local protocols, and shared decision-making with patients remain the clinician's responsibility.

How should I cite or verify the formula?

Check the References section on this page for primary literature and guideline sources. Compare outputs with primary publications if your institution uses a modified variant.

APACHE II Score

Critical Care · Disease Severity

Severity of disease classification system for ICU patients.

How this calculator is expressed

Formula or scoring rule as stored in YMed Atlas (verify against references before clinical use):

Complex calculation based on multiple physiologic measurements

Related calculators

Frequently asked questions

What is the APACHE II Score used for?: The APACHE II Score helps clinicians apply the Disease Severity framework within Critical Care. Use the inputs on this page to compute the published score or result, then interpret it alongside history, examination, and other tests—not as a replacement for judgment.
Are results from this tool medical advice?: No. YMed Atlas calculators are educational and workflow supports. Validation, local protocols, and shared decision-making with patients remain the clinician's responsibility.
How should I cite or verify the formula?: Check the References section on this page for primary literature and guideline sources. Compare outputs with primary publications if your institution uses a modified variant.

Back to Calculators

Inputs and parameters

{
  "gcs": {
    "max": 15,
    "min": 3,
    "type": "number",
    "label": "Glasgow Coma Scale"
  },
  "wbc": {
    "max": 100,
    "min": 0,
    "type": "number",
    "label": "WBC Count"
  },
  "sodium": {
    "max": 200,
    "min": 100,
    "type": "number",
    "label": "Serum Sodium"
  },
  "heartRate": {
    "max": 300,
    "min": 0,
    "type": "number",
    "label": "Heart Rate"
  },
  "potassium": {
    "max": 10,
    "min": 1,
    "type": "number",
    "label": "Serum Potassium"
  },
  "arterialPH": {
    "max": 8,
    "min": 6.5,
    "type": "number",
    "label": "Arterial pH"
  },
  "creatinine": {
    "max": 20,
    "min": 0,
    "type": "number",
    "label": "Serum Creatinine"
  },
  "hematocrit": {
    "max": 60,
    "min": 20,
    "type": "number",
    "label": "Hematocrit"
  },
  "oxygenation": {
    "type": "number",
    "label": "A-aDO2 or PaO2"
  },
  "temperature": {
    "max": 45,
    "min": 30,
    "type": "number",
    "label": "Temperature (°C)"
  },
  "respiratoryRate": {
    "max": 100,
    "min": 0,
    "type": "number",
    "label": "Respiratory Rate"
  },
  "meanArterialPressure": {
    "max": 200,
    "min": 30,
    "type": "number",
    "label": "Mean Arterial Pressure"
  }
}

References

Critical Care Medicine 1985

Back to Calculators

Inputs and parameters

{
  "gcs": {
    "max": 15,
    "min": 3,
    "type": "number",
    "label": "Glasgow Coma Scale"
  },
  "wbc": {
    "max": 100,
    "min": 0,
    "type": "number",
    "label": "WBC Count"
  },
  "sodium": {
    "max": 200,
    "min": 100,
    "type": "number",
    "label": "Serum Sodium"
  },
  "heartRate": {
    "max": 300,
    "min": 0,
    "type": "number",
    "label": "Heart Rate"
  },
  "potassium": {
    "max": 10,
    "min": 1,
    "type": "number",
    "label": "Serum Potassium"
  },
  "arterialPH": {
    "max": 8,
    "min": 6.5,
    "type": "number",
    "label": "Arterial pH"
  },
  "creatinine": {
    "max": 20,
    "min": 0,
    "type": "number",
    "label": "Serum Creatinine"
  },
  "hematocrit": {
    "max": 60,
    "min": 20,
    "type": "number",
    "label": "Hematocrit"
  },
  "oxygenation": {
    "type": "number",
    "label": "A-aDO2 or PaO2"
  },
  "temperature": {
    "max": 45,
    "min": 30,
    "type": "number",
    "label": "Temperature (°C)"
  },
  "respiratoryRate": {
    "max": 100,
    "min": 0,
    "type": "number",
    "label": "Respiratory Rate"
  },
  "meanArterialPressure": {
    "max": 200,
    "min": 30,
    "type": "number",
    "label": "Mean Arterial Pressure"
  }
}

References

Critical Care Medicine 1985