What diagnostic tests are most useful in confirming a diagnosis of aspiration

In a primary care setting, the diagnosis of aspiration pneumonia is primarily clinical, supported by history and physical examination. The most useful diagnostic test to confirm the diagnosis is a chest X-ray, which can identify infiltrates consistent with pneumonia and help differentiate aspiration pneumonia from other causes of lower respiratory tract infection. Sputum samples may be collected if productive cough is present, but microbiological confirmation is less commonly performed in primary care. Blood tests and oxygen saturation measurement can assist in assessing severity but are not diagnostic. Advanced imaging such as CT thorax and microbiological tests (e.g., sputum culture, nucleic acid amplification tests) are generally reserved for secondary care or complicated cases. Therefore, chest X-ray remains the key diagnostic test to confirm aspiration pneumonia in primary care when clinical suspicion exists.