Fev1 Copd Stages And What Your Results Mean If you also do your own lung tests at home, it could help you keep better track of your health. a gadget called a peak flow meter lets you do that. you hold it in your hand and blow into it. In a healthy person, oxygen saturation levels in arterial blood fall between 95 and 100 percent, according to the world health organization (who) 3. a reading below 95 percent in a healthy person with normal lung function indicates low oxygen levels in the blood, a condition medically termed hypoxemia that requires medical investigation. Lung Function What Do The Lungs Do Medical And Health A pulmonary function test is also called a spirometry test. a person will need to calculate the fev1 percentage function lung healthy reading as a percentage of the predicted value for healthy individuals of the same age. anyone can assume from it that a certain healthy percentage would be helpful if follow the books their The reference value is based on healthy