[FIVNAT 1996 report. French National Register on In Vitro Fertilization].

In 1996, the French National Register on in vitro fertilization, FIVNAT, has collected information on 32,490 IVF oocyte recoveries, from which 65.0% were conventional IVF cycles and 34.6% were ICSI. No modification was observed concerning the women's age. On the opposite men's age increased slightly. A small increased was observed in the pregnancy rate per recovery (20.5%) and per transfer (26.0%). The fertilization rate (49.2%) was at the same level than in 1995. The same was true for the mean numbers of oocytes but the mean number of embryos increased at 4.14 +/- 4.0. The mean number of transferred embryos significantly decreased to 2.53 +/- 0.95 per transfer. For conventional IVF, the percentage of infertilities of tubal origin was 51%, whereas almost 40% of the recoveries involved a male factor. The percentage of inseminations realised with a donor's semen, which had decreased in 1995, remained low in 1996 (2.6%). The stimulative regimen involved a GnRH analogue mostly with a long blockage period (78.6%) which was associated to the highest pregnancy rate. Only 12.8% of the transfers involved more than 3 embryos, and were associated to a relatively poor pregnancy rate, confirming that they were preferently realised in couples with poor chances of pregnancy.