Pneumonia Diagnosis Make an Appointment Refer a Patient Ask a Question Reviewed by Wendi Drummond, DO (August 01, 2017) How is Pneumonia Diagnosed? To diagnose pneumonia, the health care provider begins with a thorough medical history and physical exam. The health care provider may order tests to help diagnose pneumonia. Chest X-rays can often be used find out if a person has pneumonia. A CT scan may also be ordered. Blood and urine tests and sputum tests are very helpful to find out the cause of pneumonia. A biopsy (taking a lung tissue sample) may be done in severe or more stubborn cases. Pneumonia Symptoms Pneumonia Treatment Clinical Trials For more than 100 years, National Jewish Health has been committed to finding new treatments and cures for diseases. Search our clinical trials.