Ultrasound Findings in a Pediatric Population

The purpose of this study is to investigate whether focused ultrasound of the chest can be used in a practical way in children with respiratory symptoms. The investigators will examine the different ways in which the ultrasound examination can be performed and what the examination may show in children with different types of respiratory symptoms. The investigators will also investigate how this type of ultrasound examination can be introduced and used in everyday practice in a paediatric department. The results will help understand how chest ultrasound can best be used in children and which examination method is most suitable for future use.

Inclusion Criteria: * Clinical respiratory symptoms tentative diagnosed by an emergency doctor or an emergency nurse, including cough, wheezing, stridor, prolonged expiration, catharalia * Objective signs of respiratory infection: Fever, increased respiratory rate, decreased oxygen saturation, abnormal auscultation findings, or chest retractions Exclusion Criteria: * Fever with an alternative evident focus (e.g., urinary tract infection, gastrointestinal infection, or neuroinfection) diagnosed by an emergency doctor * Lack of informed consent