Pulmonary function tests are used when: 1  Screening for the presence of obstructive and/or restrictive lung diseases. 2  Determining the patient's condition prior to surgery in order to assess the risk of respiratory complications after surgery.  Evaluating the ability of a patient to be weaned off a ventilator.
Health benefits. One stalk of celery contains only about 10 calories, while a cup of chopped celery contains about 16. It also contains dietary fiber (1.6 grams per cup), which helps curb cravings because it absorbs water in the digestive tract, making you feel fuller longer.
Most people eat celery stalks, either raw, boiled or baked. One serving of celery contains 18 calories, 2 grams of fiber and 1 gram of protein. It is fat-free and low in sodium. It meets 40 percent of the U.S. Recommended Daily Allowance of vitamin K and 10 percent of vitamin A and folate.