Analysis of the influencing factors on the biochemical pregnancy after frozen-thawed blastocyst transfer

Objective To analysis the influencing factors on the biochemical pregnancy after frozen-thawed blastocyst transfer. Methods The data of 70 biochemical and 336 intrauterine pregnancy cycles from January 2014 to December 2016 were retrospectively analyzed. Results There were significant differences in female age, the occurrence of subclinical hypothyroidism (SCH) between the biochemical pregnancy group and intrauterine pregnancy group (P<0.05). Conclusion Attention to aged patients and controlling SCH before frozen-thawed blastocyst transfer will help reduce the incidence of biochemical pregnancy. Key words: Frozen-thawed blastocyst transfer; Biochemical pregnancy; Age; Subclinical hypothyroidism (SCH)