the results at four steps in the procedure can be analysed : the rate of oocyte collection is 85 to 90 per cent , the rate of fertilization , 80 to 90 per cent , the rate of embryo development , 50 to 70 per cent , and the pregnancy rate per laparoscopy , 4 to 13 per cent .
C0015914
fertilization
C0013936
embryo development