1. This was also valid for all calculated and measured pH values when the SID was varied: non-respiratory alkalosis (↑) or acidosis (↓), pCO2:respiratory acidosis (↑) or alkalosis (↓) and Atot:hyperproteinemic acidosis (↑) or hypoproteinemic alkalosis (↓) were varied and the sum of the buffer bases (BB) was always equal to the SID.