Franz Wiesbauer explains the relationship between pH, HCO3 and pCO2 and a simple rule which will help you decide whether the primary problem is respiratory or metabolic in nature.
Respiratory Alkalosis DDx
Respiratory Alkalosis = a primary acid-base disorder in which arterial pCO2 falls to a level lower than expected.
A pregnant patient has pneumonia. There are also concerns that she has a metabolic acidosis. Can you solve this metabolic muddle?