 Scintigraphy of the lungs may detect moderate to severe alterations in the perfusion and possibly ventilation of the dorso-caudal lung.The use of radio-labelled red blood cells and scintigraphy to localise and or quantify hemorrhage is not useful due to general sequestration of labeled RBC by the lung, even in the absence of hemorrhage.EIPH seldom causes the death of a horse, but if an affected horse dies and undergoes a post-mortem examination, repeated episodes of EIPH will have caused a characteristic blue-gray-brown staining in the lungs.