48 hours after egg retrieval 

2 cells                                                                   4 cells
       

 3 days after egg retrieval
(May be transferred at this time or may be allowed to grow further)

Number of embryos transferred is based on age and embryo quality

6-8 cells

Related Pages

Causes of Infertility
Infertility Evaluation
Ovulation Disorder and PCOS
Male Factor
Pelvic Factor
Unexplained Infertility
Tubal Reversal