In Vitro Fertilization Success Rates after Surgically Treated Endometriosis and Effect of Time Interval between Surgery and In Vitro Fertilization.

STUDY OBJECTIVE: To evaluate the impact of endometriosis staging and endometriomas on in vitro fertilization (IVF) outcome and to assess the optimal time interval between laparoscopy and IVF.

DESIGN: A retrospective clinical study (Canadian Task Force classification II1).

SETTING: A university-affiliated private infertility clinic.

PATIENTS: Two hundred sixteen infertile patients with endometriosis and 209 infertile patients without endometriosis.

INTERVENTIONS: Laparoscopy, IVF.

MEASUREMENTS AND MAIN RESULTS: Patients with endometriosis were classified according to American Society for Reproductive Medicine criteria; 58, 67, 63, and 28 patients had stages 1 through 4 disease, respectively. Patients with endometriosis had significantly lower estradiol on trigger day (9986 ± 6710 vs 12 220 ± 9414 pg/mL, respectively) and number of retrieved oocytes (12.7 ± 8.6 vs 14.0 ± 10, respectively) compared with controls. We found a consistent decline in clinical and ongoing pregnancy rates with increasing stage of endometriosis. The presence of endometrioma in patients with stages 3 and 4 endometriosis did not alter IVF outcome. Patients with a time interval of 7 to 12 and 13 to 25 months after surgery had a favorable outcome.

CONCLUSION: IVF pregnancy rate was negatively correlated with endometriosis severity. The presence of endometriomas had no impact on IVF clinical outcome. The optimal time to perform IVF appears to be between 7 and 25 months after endometriosis surgery.