Special Procedures

Pulmonary Function Test

The pulmonary function test measures how much and how quickly you can move air out of your lungs. For this test, you force air into a mouthpiece attached to a recording device (spirometer). Since the test involves some forced breathing, you may have some temporary shortness of breath or lightheadedness. The results are used to evaluate airway obstruction and whether it is reversible with a bronchodilator. It is mandatory to diagnose & characterize asthma severity, assess the effect of medication and monitor your progress.


Do not to use bronchodilator inhalers prior to the test.


Nitric Oxide 

An innovative test to measure the amount of nitric oxide exhaled which shows how much inflammation (underlying cause of asthma) there is in the lungs. 


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Caution: Food & Beverages

Patients should refrain from eating and drinking before NO analysis. An increase in FENO has been found after the ingestion of nitrate or nitrate-containing foods, such as lettace (with a maxiumum effect 2 hours after injestion) and drinking of water and ingestion of affeine may lead to transiently altered FENO levels. It is possible that a mouthwash may reduce the effect of nitrate-containing foods. Until more is known, it is prudent when possible to refrain from eating and drinking for 1 hour before exhaled NO measurement, and to question patients about recent food intake. Alcohol ingestion reduces FENO in patients with asthma and healthy subjects FENO. 


Rhinoscopy (also known as nasal endoscopy) is a useful technique for examining the nose and sinus passages. Rhinoscopy is done with a flexible fiberoptic instrument (rhinoscope) that can be easily passed into the nasal cavity. Rhinoscopy can provide valuable information, such as whether the sinus passages are open. It is especially useful in patients who have had previous sinus surgery. In such patients, rhinoscopy can be very useful to assess the patient's progress after sinus surgery and to see whether the sinus passages have remained open or nasal polyps have regrown.


Oral Food Challenge

The food is given in gradually increasing amounts. The health care professional records the dose given, the time of administation, and observe for any local or systemic reactions that arise during the challenge.

Patch Testing

Food patch testing is used to evaluate Eosinophilic esophagitis (EE), which is an allergic condition characterized by inflammation of the esophagus (the tube which connects the throat to the stomach). Individuals with EE have a large number of a type of white blood cells (eosinophils) in their esophagus. This test determines delayed reactions to a food. Patch testing is done by placing a small amount of fresh food in an aluminum chamber, which stays in contact with the skin for 48 hours. The results are removed and read by the allergist at 72 hours. Delayed reactions would show as skin inflammation in areas which contacted the food.