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Table 4 Efficiency of cryopreservation and pregnancy potential of surviving embryos

From: Should a single blastocyst transfer policy be a clinical decision or should it depend on the embryological evaluation on day 3?

 

eSET with elective day 5 transfer

eSET with transfer day 3 or 5

Statistical significance

No. of embryos cryopreserved

640

517

 

No. of thawing cycles

188

143

 

No. of embryos thawed

286

229

 

No. of embryos surviving

200

150

 

Transferrable survival rate

200/286 (69.9)

150/229 (65.5)

NS

Subjects with thawed transfers

109

71

 

Total number of thawed transfers

171

125

 

Total number of clinical pregnancies

26

21

 

Transfer specific pregnancy rate1

26/171 (15.2)

21/125 (16.8)

NS

Subject specific pregnancy rate2

26/109 (23.9)

21/71 (29.6)

NS

  

Day 3

Day 5

 

No. of embryos cryopreserved

 

154

363

 

No. of thawing cycles

 

41

102

 

No. of embryos thawed

 

84

145

 

No. of embryos surviving

 

39

111

 

Transferrable survival rate

 

39/84 (46.4)

111/145 (76.5)

<0.001

Subjects with thawed transfers

 

26

45

 

Total number of thawed transfers

 

28

97

 

Total number of clinical pregnancies

 

4

17

 

Transfer specific pregnancy rate1

 

4/28 (14.3)

17/97 (17.5)

NS

Subject specific pregnancy rate2

 

4/26 (15.4)

17/45 (37.8)

0.05

  1. 1 Total number of pregnancies/total number of thawed transfers
  2. 2 Total number of pregnancies/number of subjects with thawed transfers