Day5冷凍囊胚懷孕率優於Day6

Day5囊胚冷凍解凍懷孕率優於Day6囊胚(39% vs 29%)

http://humrep.oxfordjournals.org/content/18/2/384.full

Table I.

Survival and development of human blastocysts vitrified on day 5 or day 6

Parameter	Age of blastocyst
	Day 5	Day 6	Total
Average age of patients (years)	34.2	34.0	34.2
No. of cycles for vitrification	164	51	215
No. of cycles for warming and transfer	172	51	223
No. of embryos vitrified and recovered	569	156	725
No. of embryos survived (%)	497 (87)a	86 (55)b	583 (80)
No. of embryos transferred	419	74	493
No. of embryos implanted (%)	86 (21)	13 (18)	99 (20)
No. of cycles transferred	165	42	207
No. of clinical pregnancies (%)	64 (39)	12 (29)	76 (37)
No. of miscarriages (%)	15 (23)	6 (50)	21 (28)
No. of deliveries	16	2	18
No. of ongoing pregnancies	33	4	37
No. of babies (male:female ratio)	21 (10:11)	2 (1:1)	23 (11:12)