Can pneumonia be tested in blood test?

Pneumonia itself cannot be definitively diagnosed through a blood test alone. However, blood tests can help in the overall assessment of pneumonia and may provide supportive information regarding the presence of an infection. Here are some aspects of how blood tests relate to pneumonia: 1. **Complete Blood Count (CBC)**: A CBC can show elevated white blood cell counts (leukocytosis), which may indicate an infection, including pneumonia. 2. **Blood Cultures**: Blood cultures can be taken to identify specific pathogens (bacteria, fungi) that may be causing pneumonia, particularly in severe cases or when a bloodstream infection is suspected. 3. **Biomarkers**: Tests for biomarkers such as C-reactive protein (CRP) or procalcitonin may help to assess the severity of infection and differentiate bacterial from viral causes, though they are not specific for pneumonia itself. 4. **Serological tests**: In some cases, specific blood tests can help identify certain pathogens (like atypical bacteria or viruses) that cause pneumonia. In combination with a physical examination, clinical history, imaging studies (like chest X-rays), and other tests, blood tests can contribute to a comprehensive assessment of pneumonia. Always consult with a healthcare professional for accurate diagnosis and appropriate testing based on individual symptoms and circumstances.