Abbreviations: CO2, Carbon dioxide; PaCO2, Arterial partial pressure of carbon dioxide; PtcCO2, Transcutaneous partial pressure of carbon dioxide; PetCO2, End-tidal partial pressure of carbon dioxide; NETS, Newborn Emergency Transport Service (Victoria); NICU, Neonatal Intensive Care Unit; PaO2/PAO2 ratio, alveolar-arterial ratio. ADC-FNN Online First, published on April 29, 2005 as 10.1136/adc...