Explanation: The patient has symptoms of CAP 🫁 and the S. pneumoniae urine antigen is most commonly used to diagnose CAP.

S. pneumoniae and L. pneumophilia urine antigen tests detect 🔍 the presence of antigens from somewhere in the body that shed into the urine. They DO NOT necessarily mean the patient has a UTI. Antigens are NOT the same as antibodies and do NOT circulate indefinitely 🚫♾

S. pneumoniae and L. pneumophilia urine antigen tests are not routinely recommended, but can be helpful for finding the etiology of CAP 🫁