Pulmonary artery

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. It is the only artery in the human body that carries deoxygenated blood. The pulmonary trunk (TP) starts at the pulmonary valve, is 5cm in length and 2cm in diameter. Hereafter, the trunk splits into two main branches, the left (APS), and right pulmonary artery (APD), which transport the deoxygenated blood further into the corresponding lungs.

Image source: cove point foundation congenital heart disease

Pulmonary artery dimensions

Region of measurementReference rangeMildly abnormalModerately abnormalSeverely abnormal
1cm below pulmonic valve1.5–2.12.2–2.52.6–2.9≥3.0
Dilation of pulmonary arteries


Br Heart J. 1986 Jul;56(1):33-44

Orphanet J Rare Dis. 2014 Dec 10;9:203