**3.1.5 Pulmonary malformations (n=3)**

The pH and the pO2, and likewise the bicarbonate concentration of the UVB, are lower in a fetus presenting a major cystic adenomatoid malformation of the left lung, type 2, with the start of hydrops and hydramnios.

In the case of type 1 adenomatoid malformation, the biological balance is normal.

The third clinical case (pulmonary hypoplasia with amniotic band syndrome) is associated with acidosis (pH of 7.20) with hypercapnia (pCO2 of 7.22 kPa); at birth, the infant presented generalised cyanosis and acute respiratory distress.
