This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
An ABG analysis shows : pH 7.2, raised pCO2, decreased HCO3;diagnosis is : 
Select and explain. 
A. Respiratory acidosis, B. Compensated metabolic acidosis, C. Respiratory and metabolic acidosis, D. Respiratory alkalosis
C: Respiratory and metabolic acidosis
Answer: C: Respiratory and metabolic acidosis 
Explanation: Answer is C (Respiratory and metabolic acidosis) lhe acid base disorder is therefore both respiratory and metabolic acidosis. There is acidosis (pH < 7.35). Raised PCO2 (acidosis) indicates that change in CO2 is in keeping with change in p1-1. The respiratory component is therefore primary. Decreased HCO3 (acidosis) indicates that change in HCO3 is also primary . The acid base disorder is therefore both respiratory and metabolic acidosis.