Your CO2 level has dropped from 25 to 11 What does this mean

It means that you are hyperventilating. Some times this is the body's response to what is called acidosis, which is a low blood PH. Since carbon dioxide is an acid in the body, the body will increase the breathing rate to "blow off" some CO2 and raise the blood's PH. This is the body's fastest way to balance blood PH. If we are too acidic, then we blow off more CO2, if we are alkalotic, we slow our breathing down and retain CO2, thereby decreasing our blood PH. Another (slower) regulator of blood PH are the kidneys. When we are chronically acidotic, our kidneys will retain bicarbonate to raise the blood PH. When we are chronically alkalotic, our kidneys will excrete bicarbonate in the urine, thereby lowering the PH.