The gold standard for<unk>  diagnosis is by examination of lung tissue under a microscope. The diagnosis is made if the pathologist sees the characteristic findings of<unk> : misplaced pulmonary veins adjacent to pulmonary arteries, abnormal alveoli with thickened interstitia and abnormal<unk>  development. Due to the rapidly progressive course of<unk> , this diagnosis is frequently made during autopsy. If<unk>  is suspected early, examination of tissue from lung biopsy results in the quickest diagnosis. Genetic testing for FOXF1 is now available and can allow for slower but non-invasive diagnosis. As not all disease-causing mutations are known, false negatives or results of uncertain significance are possible with genetic testing. There are no characteristic pattern of routine lab results or imaging findings that allow definitive diagnosis of<unk> .
Alveolar capillary dysplasia
Persistent fetal circulation
Pulmonary alveolar proteinosis
Sepsis
Congenital pulmonary airway malformation
Pneumonia
Pulmonary alveolar microlithiasis
Infant respiratory distress syndrome