NICE recommended parameters to indicate hypovolaemia or shocka
| Parameter | Indicator of hypovolaemia | Indicator of shock |
|---|---|---|
| Systolic blood pressure | <100 mmHg | <20 mmHg below baseline |
| Heart rate | >90 beats/min | >20 bpm above baseline |
| Capillary refill time | >2 s | >2 s |
| Respiratory rate | >20 breaths/min | >20 breaths/min |
| National Early Warning Score | >4 | Not mentioned |
| Urine output | Not mentioned | <0.3 mL/kg/h |
| Passive leg raise | Fluid responsiveness demonstrated | Not mentioned |
aThis table summarises two sets of criteria that are listed at different points in NICE Clinical Guideline 174.4 One set of criteria is suggested for the diagnosis of hypovolaemia and the other as a means of diagnosing any form of shock.
h = hour; NICE = National Institute for Health and Care Excellence; s = seconds