Serum/plasma concentration of a specific protein marker for detecting and monitoring acute respiratory events (e.g., severe respiratory distress or infection-related inflammation)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve had recent symptoms like extreme shortness of breath, rapid breathing, or persistent coughing—especially if these symptoms suggest an infection, allergic reaction, or other lung-related problem. It may also be used to monitor chronic conditions affecting breathing or inflammation in the respiratory tract.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (either serum or plasma) during a routine lab visit. If you’re on blood-thinning medication, let your provider know beforehand.

What the Results Mean

Higher-than-normal levels might indicate acute respiratory distress, infection, or inflammation. Lower-than-normal levels could suggest underlying issues like chronic lung disease or certain immune disorders. Your provider will interpret results in the context of your medical history and symptoms.

Common Causes of Abnormal Results

Elevated levels may be linked to conditions like pneumonia, asthma exacerbations, severe allergies, or sepsis. Lower levels might be seen in chronic obstructive pulmonary disease (COPD), cystic fibrosis, or other respiratory conditions. Always discuss findings with your doctor.