ATLS Hemorrhagic Shock Classification — free guideline decision tool
Classify hemorrhagic shock (Class I–IV) with the ATLS framework.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Heart rate | 130 /min |
|---|---|
| Systolic BP | 95 mmHg |
| Mental status | Normal |
| Urine output | > 30 mL/h |
→ATLS classClass III
- Classification：Worst parameter → Class III (HR 130, SBP 95, mental status/urine output)
- Estimated blood loss：30–40% (1500–2000 mL)
- Resuscitation：Aggressive resuscitation + early blood products; definitive hemorrhage control within 60 min; assess for massive transfusion (ABC score)
| Heart rate | 130 /min |
|---|---|
| Systolic BP | 95 mmHg |
| Mental status | Confused/lethargic |
| Urine output | < 5 mL/h (minimal/none) |
→ATLS classClass IV
- Classification：Worst parameter → Class IV (HR 130, SBP 95, mental status/urine output)
- Estimated blood loss：> 40% (> 2000 mL)
- Resuscitation：Immediate massive transfusion + emergency surgical hemostasis; life-threatening
Common questions
What is ATLS Hemorrhagic Shock Classification?
Classify hemorrhagic shock (Class I–IV) with the ATLS framework.
How is ATLS Hemorrhagic Shock Classification calculated? What is the core formula?
Class by the worst of heart rate, systolic BP, mental status and urine output. I < 15%, II 15–30%, III 30–40%, IV > 40% blood volume (70 kg).
When is ATLS Hemorrhagic Shock Classification used?
Estimate blood loss and guide trauma resuscitation intensity.
What are the key clinical points for ATLS Hemorrhagic Shock Classification?
Class III onward needs blood products and source control within 60 min. Class IV needs massive transfusion and emergency surgery. Integrate with shock index, lactate and base deficit.
What are the limits and cautions when using ATLS Hemorrhagic Shock Classification?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is ATLS Hemorrhagic Shock Classification calculated in practice? Can you show a worked example?
Inputs: Heart rate 130 /min, Systolic BP 95 mmHg, Mental status Normal, Urine output > 30 mL/h → Result: ATLS class Class III（Classification: Worst parameter → Class III (HR 130, SBP 95, mental status/urine output), Estimated blood loss: 30–40% (1500–2000 mL), Resuscitation: Aggressive resuscitation + early blood products; definitive hemorrhage control within 60 min; assess for massive transfusion (ABC score)） Inputs: Heart rate 130 /min, Systolic BP 95 mmHg, Mental status Confused/lethargic, Urine output < 5 mL/h (minimal/none) → Result: ATLS class Class IV（Classification: Worst parameter → Class IV (HR 130, SBP 95, mental status/urine output), Estimated blood loss: > 40% (> 2000 mL), Resuscitation: Immediate massive transfusion + emergency surgical hemostasis; life-threatening）
Run ATLS Hemorrhagic Shock Classification now
Classify hemorrhagic shock (Class I–IV) with the ATLS framework.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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