Definition of recurrent pregnancy loss classically is

Recurrent pregnancy loss (RPL) is classically defined as three or more consecutive pregnancy losses <20 weeks' gestation or with a fetal weight <500 g. Mindful of this threshold, data from two large studies showed the risk for a subsequent miscarriage to be similar whether the following two or three prior pregnancy losses Hence the American Society for Reproductive Medicine (2013) now defines RPL as two or more failed pregnancies confirmed by sonographic or histopathological examination. Reference: William's Obstetrics; 25th edition; Chapter 18; Aboion