Final answer:
A newborn with central cyanosis and a pulse oximeter reading of 68% requires immediate medical attention, including the administration of supplemental oxygen and possibly further resuscitation.
Step-by-step explanation:
A newborn with central cyanosis that is not resolving after 5 minutes and a pulse oximeter reading of 68% requires immediate medical intervention. Considering that the baby has a heart rate of 140 and is breathing with no distress, the primary concern here is the low oxygen saturation. The Apgar score, which assesses criteria including skin color, heart rate, reflexes, muscle tone, and respiration, may also be low in this scenario. Typically, an Apgar score less than 7 at the 5-minute mark may indicate a need for medical assistance. However, given the oxygen saturation is critically low, the next step would be to stabilize the infant's oxygen levels by providing supplemental oxygen and preparing for additional resuscitative measures that may include positive pressure ventilation or advanced neonatal life support, depending on the infant's condition and response to initial interventions.