A doppler test done during the 1st Trimester of pregancy can find congestive heart failure in the fetus. This is linked to 40% of miscarriages.
http://www.thebostonchannel.com/health/2676732/detail.html?treets=bos&tml=bos_health&ts=T&tmi=bos_health_1_12150112032003
http://www.thebostonchannel.com/health/2676732/detail.html?treets=bos&tml=bos_health&ts=T&tmi=bos_health_1_12150112032003