When Should You Get a Lung Transplant for ILD? Key Signs

For people with Interstitial Lung Disease (ILD)—a group of conditions that cause scarring (fibrosis) or inflammation in the lungs—a lung transplant can be a life-extending option when the disease progresses ^[1]. The most important thing to know is that a transplant evaluation should be considered early ^[2]. The goal is to get on the radar of a transplant center long before an emergency arises ^[3]. Getting evaluated does not mean you will be put on a transplant list immediately; rather, it is a proactive step that allows the transplant team to monitor your health and prepare if a transplant becomes necessary down the road ^[2].

Why Early Referral Matters

Interstitial lung disease can worsen unpredictably ^[4]. Some forms of the disease, like Idiopathic Pulmonary Fibrosis (IPF) (lung scarring with no known cause) and other Progressive Pulmonary Fibrosis (PPF) (a pattern of worsening scarring that can happen in several types of ILD), can cause lung function to decline over time ^[5].

If you wait until you are severely ill or experiencing respiratory failure to seek an evaluation, your severe illness may increase surgical risks or make a transplant less feasible ^[2]. Referring you early gives the transplant center time to assess your overall health, address any potential roadblocks (such as nutrition, heart health, or other medical conditions), and track your disease trajectory ^[3].

Key Triggers for a Transplant Referral

Your pulmonologist will monitor several indicators to decide when to refer you to a transplant center. According to guidelines from organizations like the International Society for Heart and Lung Transplantation (ISHLT), you should start discussing an evaluation if you experience any of the following:

Declining Lung Function

Pulmonary function tests (PFTs) measure how well your lungs are working. Your team will track:

• Forced Vital Capacity (FVC): The total amount of air you can forcefully exhale. A relative decline of 10% or more in your FVC over time is a strong indicator of disease progression and often prompts listing discussions ^[4]. However, even an absolute drop of 5% in your FVC percentage over a 6 to 12-month period, when combined with worsening symptoms, shows the disease is progressive and should prompt an early referral ^[6].
• Diffusing Capacity for Carbon Monoxide (DLCO): A measure of how efficiently gases move from the air sacs in your lungs into your bloodstream ^[7]. An absolute drop of 10% or more in DLCO is another marker of progression ^[6].

Increasing Oxygen Needs

You do not need to wait until you are on high amounts of oxygen to get a referral. In fact, any new requirement for supplemental oxygen is often a trigger for a transplant evaluation ^[1]. If your oxygen saturation drops to 88% or lower during a standardized six-minute walk test, this is a marker of more advanced disease; it should prompt a clinical review of your exertional oxygen needs and a transplant referral discussion ^[7].

Worsening Symptoms and Complications

Other warning signs include:

• Increasing dyspnea: Feeling significantly more short of breath during your normal daily activities ^[2].
• Pulmonary hypertension: High blood pressure in the arteries of your lungs, which puts extra strain on your heart ^[8].
• Hospitalizations: Any hospitalization for a respiratory decline, a pneumothorax (collapsed lung), or an acute exacerbation (a sudden, severe worsening of your breathing) ^[9].

Safety Warning: If you experience severe breathlessness at rest, blue lips, confusion, chest pain, or rapidly worsening symptoms, seek emergency medical care immediately—do not wait for a transplant consultation.

Evaluation vs. Listing

It is important to understand the difference between being referred for an evaluation and being listed for a transplant ^[2].

Being evaluated early ensures that if you do need to be listed, you are already known to the team and optimized for surgery.

What You Can Do Now

While waiting for a referral or evaluation, there are proactive steps you can take:

• Stay Active: Participate in pulmonary rehabilitation if it is available to you, and maintain your nutrition.
• Follow Treatments: Continue taking your prescribed ILD medications and use your oxygen exactly as directed.
• Protect Your Health: Stay up-to-date on vaccinations (flu, pneumonia, COVID-19) and avoid smoking or exposure to secondhand smoke.