An evaluation of four tests used to ascertain Veres needle placement at closed laparoscopy

The double click, aspiration, and hanging drop tests provide very little useful information on the placement of the Veres needle at the time of closed laparoscopy. The initial gas pressures provide considerable information on the placement of the Veres needle, in particular the likelihood of preperitoneal insufflation. We conclude that the initial gas pressure is the only valuable measure to reflect correct intraperitoneal Veres needle placement.