How is respiratory acidosis defined in terms of blood gas levels?

Respiratory acidosis is defined by a decrease in blood pH and an increase in carbon dioxide (CO2) levels in the blood. In this condition, the lungs are unable to adequately remove CO2, leading to its accumulation. This increase in CO2 leads to the formation of carbonic acid, resulting in a lower pH, which indicates an acidotic state in the body's internal environment. Therefore, the presence of decreased pH alongside increased CO2 levels is a hallmark of respiratory acidosis and is critical for proper diagnosis and management of the condition.