What color indicates that the lungs are not being ventilated or that there is low cardiac output on a CO2 detector?

The appropriate color indicating that the lungs are not being ventilated or that there is low cardiac output on a CO2 detector is blue or purple. This color change occurs when the detector is exposed to an environment with little or no carbon dioxide (CO2) present, which can happen if there is insufficient ventilation or poor blood circulation that would otherwise deliver CO2 for exhalation.

In clinical practice, the presence of blue or purple on a CO2 detector signals a critical situation that requires immediate intervention, as it suggests that the newborn may not be receiving sufficient ventilation or may be experiencing inadequate perfusion. This finding directs healthcare providers to assess the need for resuscitation efforts, including effective ventilation or improving circulation.