Understand blood volume, loss classifications, and first aid priorities
| Group | Estimated Blood Volume | Notes |
|---|---|---|
| ? Adult Male | 4,100–4,700 mL | ~70 mL/kg body weight |
| ? Adult Female | 3,300–3,800 mL | Slightly lower than males |
| ? Child | 1,200–1,500 mL | Depends on age/size (80 mL/kg) |
| ? Infant | 300–400 mL | Approx. 80–90 mL/kg body weight |
| Class | Blood Loss | % of Volume | Signs and Symptoms |
|---|---|---|---|
| Class I | < 750 mL | < 15% | Usually no symptoms |
| Class II | 750–1,500 mL | 15–30% | Fast heart rate, pale skin, anxiety |
| Class III | 1,500–2,000 mL | 30–40% | Low blood pressure, confusion, rapid breathing |
| Class IV | > 2,000 mL | > 40% | Severe shock, unconsciousness, death risk |
| Group | Life-Threatening Blood Loss | First Aid Action |
|---|---|---|
| ? Adults | > 1,500 mL (30%+) | Lay flat, control bleeding, call 999 |
| ? Children | > 500 mL |
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