Patient’s oxygen levels are obviously very important. Pulse oximetry is routinely done in our office to help measure patient’s oxygen levels. This gives us a good idea of not only how severe a patient’s disease is, but also if a patient is sick and how sick they really are. Generally, the patient will walk on a treadmill or down a long hall while the oxygen levels are measured in real time. This enables us to determine whether or not a patient may need oxygen when walking or performing everyday activities as well as at rest. We are able to measure a patient’s oxygen levels while the patient is exerting by a test called a 6 minute walk. Generally the patient will walk on a treadmill or down a long hall while the oxygen levels are measured in real time. This enables us to determine whether or not a patient may need oxygen when walking or performing everyday activities as well as at rest.