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Asthma in Teens and Adults - Exams and Tests
SYMPTOMS & TREATMENTS
- Overview
-
Health Tools
- FAQs
- Cause
- Symptoms
- What Happens
- What Increases Your Risk
- When to Call a Doctor
- Exams and Tests
- Treatment Overview
- Prevention
- Living With Asthma
- Medications
- Other Treatment
- Other Places To Get Help
- Related Information
- References
- Credits
A diagnosis of asthma is based on your medical history, a physical exam, and lung function tests. If you developed asthma in adulthood, your doctor will ask about your job to figure out whether you have occupational asthma.
Lung function tests can diagnose asthma, determine its severity, and check for complications.
- Spirometry is the most common test used
to diagnose asthma. It measures how quickly you can move air in and out of your
lungs and how much air is moved. The test helps your doctor decide whether
airflow is decreased because of
inflammation in the bronchial tubes
and whether the
tubes can return to their usual size in a short time after using medicine.
Doctors also recommend the test at least every 1 to 2 years after asthma
treatment has begun. - Testing of daytime changes in peak expiratory flow (PEF) is done over 1 to 2 weeks. This test is needed when you have symptoms off and on but have normal spirometry test results.
- An exercise or inhalation challenge may be used if the spirometry test results have been normal or near normal but asthma is still suspected. These tests measure how quickly you can breathe in and out after exercise or after using a medicine. An inhalation challenge also may be done using a specific irritant or allergen if your doctor suspects occupational asthma.
Regular checkups
You need to monitor your condition and have regular checkups to keep asthma under control and to review and possibly update your asthma action plan. Checkups are recommended every 1 to 6 months, depending on how well your asthma is controlled.
During checkups, your doctor will ask whether your symptoms and peak expiratory flow have held steady, improved, or become worse and will ask about asthma attacks during exercise or at night. You track this information in an asthma diary. You may be asked to bring your peak expiratory flow meter to an appointment so your doctor can see how you use it. Based on the results, your asthma category may change, and your doctor may change the medicines you use or how much medicine you use.
Tests for other diseases
Asthma sometimes is hard to diagnose, because symptoms vary widely from person to person and within each person over time. Symptoms may be the same as those of other conditions, such as influenza or other viral respiratory infections or vocal cord dysfunction. Tests done to determine whether diseases other than asthma are causing your symptoms include the following:
- Additional lung function tests may be needed if other lung diseases, such as chronic obstructive pulmonary disease (COPD), are suspected.
- An electrocardiogram (EKG, ECG) measures the electrical signals that control the rhythm of your heartbeat. This test might be done to rule out serious conditions with similar symptoms, such as chronic heart failure.
- A bronchoscopy test involves using a flexible scope called a bronchoscope to examine the airways. Sometimes airway problems such as tumors or foreign bodies will create symptoms that mimic those of asthma. The test might be done if you have unequal wheezing in the lungs or a poor response to asthma therapy. Biopsies of the airways can be done to look for changes that point to asthma.
- A chest X-ray may be used to see whether other lung diseases, such as fibrous tissue caused by chronic inflammation (pulmonary fibrosis), are causing symptoms.
- Blood tests may be done. For example, a complete blood count (CBC) may be done to look for signs of an infection or other condition.
Tests to identify triggers
If you have persistent asthma and take medicine every day, your doctor may ask about your exposure to substances (allergens) that cause an allergic reaction. For more information about the following tests, see the topic Allergic Rhinitis.
Allergy tests include:
- Skin tests. The skin on the back or arms is pricked with one or more small doses of allergens that might cause an allergy. The amount of swelling and redness at the sites of the skin pricks is measured to see which allergens cause a reaction. Skin tests are quick, simple, and relatively safe. Skin tests are needed if you are interested in allergy shots (immunotherapy).
- Enzyme-linked immunosorbent assay (ELISA). A blood sample is taken from a vein and tested for immunoglobulin E (IgE) antibodies, which are produced in response to particular allergens.
Other tests may be done to see whether other conditions such as sinusitis, nasal polyps, or gastroesophageal reflux disease (GERD) are present.
| By: | Healthwise Staff | Last Revised: February 13, 2011 |
| Medical Review: | E. Gregory Thompson, MD - Internal Medicine Rohit K Katial, MD - Allergy and Immunology | |
© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.
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