COVID-19 Quick Severity IndexLoading...Respiratory rate, breaths/min≤ 22023-28+1> 28+2Pulse oximetry (lowest recorded value within first 4 hours of patient encounter)> 92%089-92%+2≤ 88%+5O2 flow rate, L/min≤ 203-4+45-6+5适用指征洞见与注意事项