第2天2顆胚胎植入與第5天1顆囊胚植入懷孕率相同

選擇第2天2顆胚胎植入(DET)或第5天1顆囊胚植入(SBT)
懷孕率均為27%

DET多胞胎率為23%

http://humrep.oxfordjournals.org/content/26/4/775.full

Table III

Clinical outcome in DET group versus SBT group.

	DET group	SBT group	P
Transfer rate	225/225 (100%)	198/225 (88%)	<0.0001
Day of transfer
Day 2	225/225 (100%)	0
Day 5	0	152/198 (77%)
Day 6	0	46/198 (23%)
Clinical pregnancy rate
Per transfer	68/225 (30.2%)	74/198 (37.4%)	NS
Per oocyte retrieval	68/225 (30.2%)	74/225 (32.9%)	NS
Clinical implantation rate	18.2%	38.4%	<0.0001
Miscarriage rate	8/68 (11.8%)	13/74 (17.6%)	NS
Ectopic pregnancy rate	0	1/74 (1.4%)	NS
Delivery rate
Per transfer	60/225 (26.7%)	60/198 (30.3%)	NS
Per oocyte retrieval	60/225 (26.7%)	60/225 (26.7%)	NS
Multiple delivery rate	14/60 (23.3%)	2/60 (3.3%)	<0.01

• DET, double embryo transfer; SBT, single blastocyst transfer; NS, non-significant.