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Table 1 Comparison of vitrification outcomes for day 3 cleavage and blastocyst stage embryos using different carriers

From: The new Rapid-i carrier is an effective system for human embryo vitrification at both the blastocyst and cleavage stage

Stage at Vitrification Cleavage   Blastocyst  
  Rapid-i Cryoloop Rapid-i Cryoloop
Patient age 33.6 ± 3.3 34.1 ± 3.7 34.2 ± 3.8 34. ± 3.2
No vitrification-warming cycles 44 71 51 90
No. vitrified embryos warmed 92 139 92 163
No. intact embryos on warming (%) 91(99) 137 (99) 89 (97) 148 (91)
Mean no. embryos thawed 2.1 ± 0.7 2.0 ± 10.4 1.8 ± 0.7 1.8 ± 0.7
No. transfers 43 70 51 85
No. embryos surviving and transferred 85 130 88 143
Mean no. embryos transferred 2.0 ± 0.5 1.9 ± 0.4 1.7 ± 0.5 1.7 ± 0.5
Implantation rate (%) 31/85 (37) 46/130 (35) 43/88 (49) 54/143(38)
Clinical pregnancy rate (%) 20/43(47) 34/70 (49) 30/51 (59) 39/85 (46)
Multiple pregnancy rate (%) 2/20 (10) 10/34 (29) 8/30 (27) 9/39 (23)
Miscarriage rate (%) 2/43 (5) 3/70 (4) 5/51 (10) 6/85 (7)
Deliveries 15 29 16 26
Infants 16 36 18 36
Boys/Girls 8/8 17/19 9/9 15/21
Ongoing pregnancies 3 2 9 7
  1. No significant differences between carriers for vitrification at either cell stage.
  2. Data expressed as mean ± SD.