TABLE 3.
Ultrasonographic parameters for evaluating retained products of conception with their cut‐off values
| Ultrasonographic parameter | Cut‐off value | RCTs (N = 79) | Observational studies (N = 169) |
|---|---|---|---|
| Endometrial thickness | 24 (30.4%) | 31 (18.3%) | |
| ≥5 mm | 1 (4.2%) | 1 (3.2%) | |
| ≥8 mm | 1 (4.2%) | 2 (6.5%) | |
| ≥10 mm | 2 (8.3%) | 4 (12.9%) | |
| ≥12 mm | n.a. | 1 (3.2%) | |
| ≥14 mm | n.a. | 1 (3.2%) | |
| ≥15 mm | 16 (66.7%) | 18 (58.1%) | |
| ≥20 mm | n.a. | 1 (3.2%) | |
| ≥30 mm | 4 (16.7%) | 3 (9.7%) | |
| Gestational sac | 15 (19.0%) | 22 (13.0%) | |
| Present or absent | 15 (100%) | 22 (100%) | |
| Intrauterine remains | 12 (15.2%) | 15 (8.9%) | |
| Present or absent | 10 (83.3%) | 12 (80%) | |
| >2 cm | n.a. | 1 (6.7%) | |
| >15 mm | n.a. | 2 (13.3%) | |
| Cavity surface area ≥6 cm2 | 1 (8.3%) | n.a. | |
| Intrauterine dimension ≥11 cm2 | 1 (8.3%) | n.a. | |
| Uterus not empty | 2 (2.5%) | 15 (8.9%) | |
| Yes or no | 2 (100%) | 15 (100%) |
Abbreviations: n.a., not available; RCT, randomized controlled trial.