An Asthma Control Test is a list of several questions used to measure how well you control your asthma. It includes 5 questions that you answer on a scale of 1-5. The highest score possible is a 25, which means your asthma is controlled very well. The lowest score possible is a 5, which means your asthma is not well controlled. It is recommended to visit your doctor if you have a number under 19 because it means your asthma is not well controlled.