 The SBT used at CCHS is a non-invasive 5-minute test performed on an intubated infant. Respiratory rates RR, expired tidal volume Vte, heart rate, and oxygen saturation by pulse oximetry SpO2 are recorded. An SBT is considered passed, when there is no apnea defined as no respiratory effort for greater than 20 seconds, no bradycardia defined as heart rate less than 100 for greater than 15 seconds, and the SpO2 has been maintained at greater than 85 or SBT VE greater than 60 than that of the mechanical VE. 