Although no reliable published data have estimated the probability of finding an etiology for recurrent pregnancy loss in a population with 2 versus 3 or more miscarriages, the best available data suggest that the risk of miscarriage in subsequent pregnancies is 30% after 2 losses, compared with 33% after 3 losses among patients without a history of a live birth. This strongly suggests a role for evaluation after just 2 losses in patients with no prior live births. An earlier evaluation may be further indicated if fetal cardiac activity was identified prior to a loss .