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| RCOG (2011) | ASRM (2012) | ESHRE (2023) |
|---|---|---|
| Three or more failed pregnancies Do not have to be consecutive |
Two or more failed clinical pregnancies | Two or more failed pregnancies Do not have to be consecutive |
| Clinical pregnancy, also includes biochemical pregnancy |
Ultrasound and histological confirmation of pregnancy | Confirmation by serum or urinary chronic gonadothropin Do not include ectopic and molar pregnancies |
