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🩸 ATLS Hemorrhagic Shock Classification

UseEstimate blood loss and guide trauma resuscitation intensity.

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SourceAmerican College of Surgeons. ATLS Student Course Manual, 10th ed. 2018

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Scene next step
📋SepsisOpen scene pack →
Related scores
Matching pathway
🧭sepsis_h1Open pathway →
Score + version; reference only — not a substitute for care · no HIS write

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Methodology · worked example, guidelines & full notes
Clinical takeaway

Class III onward needs blood products and early source control [pending update].

When to use

Estimate blood loss and guide trauma resuscitation intensity.

How it works

Class by the worst of heart rate, systolic BP, mental status and urine output. I [pending update], II [pending update], III [pending update], IV [pending update] blood volume (70 kg).

Key points

  • Class III onward needs blood products and early source control [pending update].
  • Class IV needs massive transfusion and emergency surgery.
  • Integrate with shock index, lactate and base deficit.

References

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 rate130 /min
Systolic BP95 mmHg
Mental statusMildly anxious
Urine output20–30 mL/h

→ATLS classClass III

  • Classification：Worst parameter → Class III (HR 130, SBP 95, mental status/urine output)
  • Resuscitation：Aggressive resuscitation + early blood products; early definitive hemorrhage control [pending update]; assess for massive transfusion (ABC score)
  • Response：Rapid responders are usually class I–II; transient or non-responders suggest ongoing hemorrhage needing immediate surgical/interventional control
Heart rate130 /min
Systolic BP95 mmHg
Mental statusConfused/lethargic
Urine output< 5 mL/h (minimal/none)

→ATLS classClass IV

  • Classification：Worst parameter → Class IV (HR 130, SBP 95, mental status/urine output)
  • Resuscitation：Immediate massive transfusion + emergency surgical hemostasis; life-threatening
  • Response：Rapid responders are usually class I–II; transient or non-responders suggest ongoing hemorrhage needing immediate surgical/interventional control
Verification & sources · governance
FAQ

Frequently asked questions

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.
Does ATLS Hemorrhagic Shock Classification upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
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 Mildly anxious, Urine output 20–30 mL/h → Result: ATLS class Class III（Classification: Worst parameter → Class III (HR 130, SBP 95, mental status/urine output), Resuscitation: Aggressive resuscitation + early blood products; early definitive hemorrhage control [pending update]; assess for massive transfusion (ABC score), Response: Rapid responders are usually class I–II; transient or non-responders suggest ongoing hemorrhage needing immediate surgical/interventional control） 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), Resuscitation: Immediate massive transfusion + emergency surgical hemostasis; life-threatening, Response: Rapid responders are usually class I–II; transient or non-responders suggest ongoing hemorrhage needing immediate surgical/interventional control）
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