1. The problem statement, all variables and given/known data Trying to create an equation to calculate the expected bicarbonate level given a respiratory acidosis or alkalosis (this is purely a math question, though). I am not sure if my equations are in the right format in terms of the order of operations and use of brackets, etc. 2. Relevant equations The laws are: The [HCO3-] will increase by 4 mmol/l for every 10 mmHg increase in PaCO2 above 40mmHg. The [HCO3-] will decrease by 5 mmol/l for every 10 mmHg decrease in pCO2 below 40 mmHg. By the way "24" comes from the midpoint of the normal value of HCO3-. 3. The attempt at a solution Do these equations look correct to you given the rules outlined? Particularly the subtraction for alkalosis (24- and 40 - PaCO2 as opposed to PaCO2 - 40 in the above example).