Double lung point sign (Ultrasound)

The double lung point sign refers to a sharp boundary found between relatively aerated superior lung fields and coalescent "B‐lines" (representing interstitial edema) in the basal lung fields, with a reported sensitivity of 45.6%-76.7% and a specificity of 94.8%-100%  in diagnosing transient tachypnea of the newborn.

The sign derives its name from the supposed appearance of two sonographically different lungs in apposition within one hemithorax.