Table 1 Overall accuracy of HSG diagnosis compared to the gold standard test (hysteroscopy ± diagnostic laparoscopy with dye test)
Number of patientsa | True positive | True negative | False positive | False negative | sensitivity | specificity | PPV | NPV | accuracy | P value |
|---|---|---|---|---|---|---|---|---|---|---|
Uterine cavity (n = 200) | < 0.02 | |||||||||
Congenital abnormalities of uterine shapeb | 29 | 163 | 7 | 1 | 96.9 (78–97) | 95.9 (88–97) | 80.6 (58–77) | 99.4 (81–99.5) | 96 (88–96) | |
Luminal filling defect | ||||||||||
Submucosa fibroid/polyp | 41 | 147 | 7 | 5 | 89.1 (88–91) | 95.5 (89–96) | 85.4 (82–89) | 96.7 (88–99) | 94 (81–94) | |
Adhesion | 32 | 158 | 6 | 4 | 88.9 (85–89) | 96.3 (88–94) | 84.2 (81–85) | 97.5 (89–98) | 95 (88–95) | |
Abnormal uterine contour c | 28 | 166 | 3 | 3 | 90.3 (81–91) | 98.2 (86–99) | 90.3 (85–92) | 96.4 (89–97) | 97 (91–97) | |
Tubal status (n = 128) | < 0.04 | |||||||||
Bilateral tubal patency | 72 | 53 | 1 | 2 | 97.3 (89–99) | 98.1 (93–99) | 98.6 (88–99) | 96.6 (81–97) | 97.7 (90–98) | |
Bilateral obstruction | 30 | 93 | 3 | 2 | 93.8 (87–94) | 96.9 (90–97) | 90.9 (86–92) | 97.9 (90–99) | 96.1 (89–98) | |
Unilateral obstruction | 26 | 92 | 6 | 4 | 86.7 (81–90) | 93.9 (87–95) | 81.3.8 (80–90) | 95.8 (88–98) | 92.2 (89–98) | |
Peritoneal abnormalities (n = 128) | < 0.01 | |||||||||
Peritubal adhesions | 12 | 101 | 11 | 4 | 75 (68–79) | 90.2 (83–91) | 52.2 (48–57) | 96.2 (88–97) | 88.3 (80–93 | |
Pelvic adhesions | 26 | 90 | 9 | 3 | 89.7 (81–90) | 90.9 (78–91) | 74.3 (68–80) | 96.8 (91–98) | 90.6 (88–97) |