A Translational Study to Describe Clinical Characteristics, Biomarkers and to Identify Phenotypes and Endotypes Associated With Differential Outcomes in Chinese Population

This study is collecting detailed information about asthma patients in China — including blood markers, lung function, and other health data — to better understand the different types of asthma and why some people respond differently to treatments. **You may be eligible if...** - You are between 18 and 75 years old - You have been diagnosed with asthma by a doctor for at least 3 months - You have acceptable lung function test results - You are willing to follow study procedures **You may NOT be eligible if...** - You have a history of alcohol or drug abuse in the past year - You are currently pregnant - You have a recent respiratory infection (within the past 2 weeks) - You have received a biologic medication within the past 3 months - You have a terminal illness or organ failure - You are on certain asthma medications (like leukotrienes inhibitors) Talk to your doctor to see if this trial is right for you.