LabGeek: I'm sorry to hear that you have pneumonia. Pneumonia is an infection that inflames the air sacs in one or both lungs, which can cause coughing, fever, chest pain, and difficulty breathing. To diagnose pneumonia, several laboratory tests may be needed to confirm the infection and identify the cause of the infection. Here are some tests that may be useful in diagnosing pneumonia: Complete Blood Count (CBC): This test measures different types of blood cells, including white blood cells, which help fight infections. A high white blood cell count can indicate an infection, while a low count can suggest a weakened immune system. Blood culture: This test is used to identify the bacteria or fungi that are causing the infection. Blood is collected and incubated in a special medium to allow the microorganisms to grow, and then they are identified through various methods. Chest X-ray: This imaging test can help identify the location and extent of lung inflammation or infection. Sputum culture: This test involves collecting a sample of phlegm or mucus coughed up from the lungs and testing it for bacteria or other microorganisms. Pulse oximetry: This test measures the level of oxygen in your blood and can help determine if your pneumonia is affecting your lungs' ability to take in oxygen. Please keep in mind that your doctor will determine which tests are necessary based on your specific condition and medical history. It's important to follow your doctor's advice and recommendations for treatment.