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turnover of procedures. Outcome measures were the rate of cycles with successful oocyte recovery and successful fertilization.RESULTS: In 61% of the cycles OR was scheduled before or just at the start of the LH surge whereas in the remaining cases it was scheduled after LH surge has already started. Most of the procedures (76%) could be performed in a 2-hour interval between 8-10 AM, whereas the remaining ones were finished until 5PM. Overall premature ovulation and successful oocyte recovery rates were 4% (45/1138) and 78% (886/1138). There were no significant differences in the proportion of cycles with successfully recovered (76, 84, 71, 88 and 67%, P¼0.66) or fertilized oocytes (55, 64, 47, 68 and 67%, P¼0.1) between subgroups 1 to 5, respectively. CONCLUSION: In natural cycle IVF treatment OR scheduling based on the occurrence of spontaneous LH surge yields acceptable oocyte recovery and fertilization rates. This strategy combined with a rapid and low-risk OR procedure permits the management of a large nIVF program within working hours on a 7-days week basis. P-289 Tuesday, OBJECTIVE: The aim of this study is to compare the effect of an oral contraceptive (OC) with that of hormone replacement therapy (HRT) on bone S198 ASRM Abstracts

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