Résumé
Since the birth of Louise Brown, implatation rate per embryo is the most important limiting factor in successful ICSI cycle. Blastocyst is claimed to be logic solution for this problem by its high implantation rate. Randomized prospective clinical study. To study benefits and pitfalls of blastocyst transfer. Patients and One hundred and seventeen candidates were divided into 2 groups. Group I [n=58] in whom at least 4 grade I embryos were transferred on day 3. Group II [n=57] in whom two to three blastocyst were transferred. Clinical pregnancy rate per cycle was 27.6% in day 3 group compared to 31.6% in blastocyst group while multiple pregnancy rate was 43.4% and 33.3% respectively. Blastocyst transfer is a reasonable solution for the problem of multiple pregnancy but it is not associated with significant increase in the pregnancy rate