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Objective: To provide detailed information about costs of in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) treatment stages and to estimate the cost per IVF and ICSI treatment cycle and ongoing pregnancy., Design: Descriptive micro-costing study., Setting: Four Dutch IVF centers., Patient(s): Women undergoing their first treatment cycle with IVF or ICSI., Intervention(s): IVF or ICSI., Main Outcome Measure(s): Costs per treatment stage, per cycle started, and for ongoing pregnancy., Result(s): Average costs of IVF and ICSI hormonal stimulation were euro 1630 and euro 1585; the costs of oocyte retrieval were euro 500 and euro 725, respectively. The cost of embryo transfer was euro 185. Costs per IVF and ICSI cycle started were euro 2381 and euro 2578, respectively. Costs per ongoing pregnancy were euro 10,482 and euro 10,036, respectively., Conclusion(s): Hormonal stimulation covered the main part of the costs per cycle (on average 68% and 61% for IVF and ICSI, respectively) due to the relatively high cost of medication. The costs of medication increased with increasing age of the women, irrespective of the type of treatment (IVF or ICSI). Fertilization costs (IVF laboratory) constituted 12% and 20% of the total costs of IVF and ICSI. The total cost per ICSI cycle was 8.3% higher than IVF.

A prospective, randomized, double-blind, multicentre (n = 6) study was conducted to compare the influence of either a 150 or 250 IU daily fixed-dose regimen of recombinant follicle stimulating hormone (FSH, Puregon) on the number of oocytes retrieved and the total dose used in down-regulated women between 30 and 39 years of age undergoing ovarian stimulation. In all, 138 women were treated with recombinant FSH, 67 with 150 IU and 71 with 250 IU. The number of oocytes retrieved in the low-dose group was 9.1 compared to 10.6 in the high-dose group (not significant). In the 30-33 years of age class receiving the 250 IU dose, a surplus of 4.2 oocytes (14.8 versus 10.6) was found, whereas in the 37-39 age class nearly one oocyte more was retrieved in the 150 IU group (8.1 versus 7.4). The total dose used to reach the criterion for human chorionic gonadotrophin (HCG) administration was 1727 IU for the women treated with 150 IU daily and 2701 IU for the 250 IU treated women (P < 0. 001). No significant relationships were found between serum FSH concentrations as obtained in the early follicular phase and the number of oocytes collected, or the total dose. It is concluded that in women between 30 and 39 years of age, the decline in number of oocytes retrieved with increasing age cannot be overcome by augmenting the daily dose of recombinant FSH from 150 to 250 IU.