A female patient after injury comes to casualty. Her ABG shows low pH. PCO2 high, bicarbonate normal.The diagnosis is -
First step

Determine whether academia or alkalemia is present
pH is low, indicating acidosis

Second step

Inspect HCO3-/CO2 to determine the cause of alkalemia or academia.
In this case, the pCO2 is high and the bicarbonate is normal, so the acidosis can be easily attributed to increased CO2
Thus, this is a case of respiratory acidosis
Respiratory alkalosis
Respiratory acidosis
Metabolic acidosis
Metabolic alkalosis