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Table 3 Performance (sensitivity, specificity, positive predictive value (PV+) and negative predictive value (PV)) of various entry tests in predicting correct placement of the Veres needle

From: Laparoscopic entry—the experience of a range of gynaecological surgeons

  Sensitivity (%) Specificity (%) PV+ (%) PV (%)
Saline injection 99.2 1.4 83.6 25.0
Aspiration 98.4 1.7 84.4 16.7
Hanging drop 93.6 11.8 85.4 25.0
IAP < 10 mmHg 92.5 14.1 86.5 23.8
Falling column 91.9 14.8 86.8 23.1
Double click 90.6 19.7 86.7 26.8