Final answer:
Hypercapnic Respiratory Failure may be identified by abnormally elevated blood levels of CO2 (hypercapnia) or abnormally low blood levels of CO2 (hypocapnia).
Step-by-step explanation:
Hypercapnic Respiratory Failure may be identified by an abnormally elevated blood levels of CO2, which is known as hypercapnia. Hypercapnia can occur in any situation that impairs respiratory functions, such as pneumonia, congestive heart failure, or reduced breathing due to drugs or holding one's breath. On the other hand, abnormally low blood levels of CO2, known as hypocapnia, occur with causes of hyperventilation that drive off CO2, such as salicylate toxicity or hyperventilation due to fever or hypoxia.