A second study was performed assessing the SenTec monitor during neonatal High Frequency Oscillatory Ventilation. Fourteen neonatal patients were studied. The digital sensor was applied to each patient on varying body parts that included the left chest, right chest, and liver. Fifteen minutes after sensor application, an ABG was obtained and the simultaneously displayed TCCO2 measurement was recorded. ABG measurements were subsequently analyzed using a Siemens Rapidpoint 405 analyzer. A clinically acceptable correlation was found between the TCCO2 and PaCO2 readings (R2=0.807, p=<0.001). This study suggested the monitor could certainly be used as an alternative to ABGs.