Identifying and determining the cause of interstitial lung disease can be challenging. A large number of disorders fall into this broad category. In addition, the signs and symptoms of a wide range of medical conditions can mimic interstitial lung disease, and doctors must rule these out before making a definitive diagnosis.
Some of the following tests may be necessary.
- Blood tests. Certain bloodwork can detect proteins, antibodies and other markers of autoimmune diseases or inflammatory responses to environmental exposures, such as those caused by molds or bird protein.
- Computerized tomography (CT) scan. This imaging test is key to, and sometimes the first step in, the diagnosis of interstitial lung disease. CT scanners use a computer to combine X-ray images taken from many different angles to produce cross-sectional images of internal structures. A high-resolution CT scan can be particularly helpful in determining the extent of lung damage caused by interstitial lung disease. It can show details of the fibrosis, which can be helpful in narrowing down the diagnosis and in guiding treatment decisions.
- Echocardiogram. A sonogram for the heart, an echocardiogram uses sound waves to visualize the heart. It can produce still images of your heart's structures, as well as videos that show how your heart is functioning. This test can evaluate the amount of pressure occurring in the right side of your heart.
Pulmonary function tests
- Spirometry and diffusion capacity. This test requires you to exhale quickly and forcefully through a tube connected to a machine that measures how much air your lungs can hold, and how quickly you can move air out of your lungs. It also measures how easily oxygen can move from the lungs into the bloodstream.
- Oximetry. This simple test uses a small device placed on one of your fingers to measure the oxygen saturation in your blood. It may be done at rest or with activity to monitor the course and severity of lung disease.
Lung tissue analysis
Often, pulmonary fibrosis can be definitively diagnosed only by examining a small amount of lung tissue (biopsy) in a laboratory.
The tissue sample may be obtained in one of these ways:
- Bronchoscopy. In this procedure, your doctor removes very small tissue samples — generally no larger than the head of a pin — using a small, flexible tube (bronchoscope) that's passed through your mouth or nose into your lungs. The risks of bronchoscopy are generally minor — most often a temporary sore throat and hoarseness from the bronchoscope — but the tissue samples are sometimes too small for an accurate diagnosis.
- Bronchoalveolar lavage. In this procedure, your doctor injects about a tablespoon of salt water through a bronchoscope into a section of your lung, and then immediately suctions it out. The solution that's withdrawn contains cells from your air sacs. Although bronchoalveolar lavage samples a larger area of the lung than other procedures do, it may not provide enough information to diagnose pulmonary fibrosis.
- Surgical biopsy. Although this is a more invasive procedure with potential complications, it's often the only way to obtain a large enough tissue sample to make an accurate diagnosis. While you are under general anesthesia, surgical instruments and a small camera are inserted through two or three small incisions between your ribs. The camera allows your surgeon to view your lungs on a video monitor while removing tissue samples from your lungs.
The lung scarring that occurs in interstitial lung disease can't be reversed, and treatment will not always be effective in stopping the ultimate progression of the disease. Some treatments may improve symptoms temporarily or slow the disease's progress. Others help improve quality of life.
Because many of the different types of scarring disorders have no approved or proven therapies, clinical studies may be an option to receive an experimental treatment.
Intense research to identify treatment options for specific types of interstitial lung disease is ongoing. Based on currently available, scientific evidence, however, your doctor may recommend:
- Corticosteroid medications. Many people diagnosed with interstitial lung diseases are initially treated with a corticosteroid (prednisone), sometimes in combination with other drugs that suppress the immune system. Depending on the cause of the interstitial lung disease, this combination may slow or even stabilize disease progression.
- Medications that slow the progression of idiopathic pulmonary fibrosis. The medications pirfenidone (Esbriet) and nintedanib (Ofev) may slow the rate of disease progression. Treatment-related side effects may be significant. Talk through the pros and cons of these medications with your doctor.
- Medications that reduce stomach acid. Gastroesophageal reflux disease (GERD) affects the majority of people with idiopathic pulmonary fibrosis and is associated with worsening lung damage. If you have symptoms of acid reflux, your doctor may prescribe GERD therapies that reduce stomach acid, including H-2-receptor antagonists or proton pump inhibitors such as lansoprazole (Prevacid 24HR), omeprazole (Prilosec OTC) and pantoprazole (protonix).
Using oxygen can't stop lung damage, but it can:
- Make breathing and exercise easier
- Prevent or lessen complications from low blood oxygen levels
- Reduce blood pressure in the right side of your heart
- Improve your sleep and sense of well-being
You're most likely to receive oxygen when you sleep or exercise, although some people may use it round-the-clock.
The aim of pulmonary rehabilitation is not only to improve daily functioning but also to help people with intersitial lung disease live full, satisfying lives. To that end, pulmonary rehabilitation programs focus on:
- Physical exercise, to improve your endurance
- Breathing techniques that improve lung efficiency
- Emotional support
- Nutritional counseling
Lung transplantation may be an option of last resort for some people with severe interstitial lung disease who haven't benefited from other treatment options.
Lifestyle and home remedies
Being actively involved in your own treatment and staying as healthy as possible are essential to living with interstitial lung disease. For that reason, it's important to:
- Stop smoking. If you have lung disease, the best thing you can do for yourself is to stop smoking. Talk to your doctor about options for quitting, including smoking cessation programs, which use a variety of proven techniques to help people quit. And because secondhand smoke also can be harmful to your lungs, don't allow people to smoke around you.
- Eat well. People with lung disease may lose weight both because it's uncomfortable to eat and because of the extra energy it takes to breathe. These people need a nutritionally rich diet that contains adequate calories. A dietitian can give you further guidelines for healthy eating.
- Get vaccinated. Respiratory infections can worsen symptoms of intersitial lung disease. Make sure you receive the pneumonia vaccine and an annual flu shot.
Coping and support
Living with a chronic lung disease is emotionally and physically challenging. Your daily routines and activities may need to be adjusted, sometimes radically, as breathing problems worsen or health care needs take priority in your life. Feelings of fear, anger and sadness are normal as you grieve for the loss of your old life and worry about what's next for you and your family.
Share your feelings with your loved ones and your doctor. Talking openly may help you and your loved ones cope with the emotional challenges of your disease. In addition, clear communication will help you and your family plan effectively for your needs if your disease progresses.
You may also want to consider joining a support group, where you can talk to people who are facing challenges similar to yours. Group members may share coping strategies, exchange information about new treatments or simply listen as you express your feelings. If a group isn't for you, you may wish to talk with a counselor in a one-on-one setting.
Preparing for your appointment
You'll probably first bring your symptoms to the attention of your family doctor. He or she may refer you to a pulmonologist — a doctor who specializes in lung disorders. Testing generally includes a variety of blood tests, a CT scan of the chest and pulmonary function testing.
What you can do
Before your appointment, you might want to write a list that answers the following questions:
- What are your symptoms and when did they start?
- Are you receiving treatment for any other medical conditions?
- What medications and supplements have you taken in the past five years, including over-the-counter medications or illicit drugs?
- What are all the occupations you've ever had, even if only for a few months?
- Do any members of your family have a chronic lung disease of any kind?
- Have you ever received chemotherapy or radiation treatments for cancer?
- Do you have any other medical conditions, especially arthritis?
If your primary care physician had a chest X-ray done as part of your initial evaluation, bring that with you when you see a pulmonologist. It will help the pulmonologist make a diagnosis if he or she can compare an old chest X-ray with the results of a current X-ray.
The actual X-ray image is more important to your doctor than is the report alone. CT scans of your chest also may have been done, and those should also be requested.
What to expect from your doctor
Your doctor may ask some of the following questions:
- Are your symptoms persistent, or do they seem to disappear and then reappear?
- Have you recently had new contact with the following: air conditioners, humidifiers, pools, hot tubs, or water-damaged walls or carpet?
- Are you exposed to mold or dust in your home or other homes where you spend a lot of time?
- Have any close relatives or friends been diagnosed with a related condition?
- Do you come into contact with birds through your work or hobbies? Does a neighbor raise pigeons?
- Does your work history include regular exposure to toxins and pollutants, such as asbestos, silica dust or grain dust?
- Do you have any family history of lung disease?
- Do you or did you smoke? If so, how much? If not, have you spent a lot of time around others who smoke?
- Have you been diagnosed or treated for any other medical conditions?
- Do you have symptoms of gastroesophageal reflux disease (GERD), such as heartburn?