FeNO Detection in Asthma Diagnosis: A New Technology Approach

Patients: Inclusion Criteria: 1. Participants must be a minimum of 18 years of age, irrespective of gender; 2. Individuals must possess a diagnosis of bronchial asthma that aligns with the international GINA 2023 diagnostic criteria; 3. Respiratory symptoms must have been evident for at least 6 weeks; 4. Participants should either have no history of smoking or have discontinued smoking for a period exceeding 5 years. Exclusion Criteria: 1. The concurrent use of additional asthma medications (such as glucocorticoids) alongside short-acting bronchodilators within the prior 4 weeks; 2. A diagnosis of respiratory infection within the preceding 4 weeks; 3. Conditions such as pregnancy, lactation, or menstruation; 4. Participation in other clinical research studies; 5. Any underlying medical or psychiatric conditions that, in the investigator's assessment, would render the individual unsuitable for participation in the study. Healthy: Inclusion Criteria: 1. Participants must be at least 18 years of age, with no restrictions on gender; 2. Individuals should not have a history of allergic diseases or chronic respiratory conditions, and must not exhibit any significant abnormalities in health assessments conducted within the past year; 3. There should be no acute illnesses or medication history within the preceding four weeks, and participants must not display any typical symptoms of respiratory infections; 4. A history of smoking is not permitted, or individuals must have ceased smoking for a minimum of five years. Exclusion Criteria: 1. Individuals who are pregnant, breastfeeding, or currently experiencing menstruation; 2. Those who have been on long-term medication; 3. Participants involved in other clinical research studies; 4. Any potential medical or psychological conditions that the researcher deems may render the subject unsuitable for participation in the study.