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. 2000 Nov;17(10):566–573. doi: 10.1023/A:1026485830540

IVF Performance of Women Who Have Fluctuating Early Follicular FSH Levels

A Lass 1, A Gerrard 1, N Abusheikha 1, F Akagbosu 1, P Brinsden 1
PMCID: PMC3455456  PMID: 11209537

Abstract

Objectives: The aim was to evaluate whether women who have early follicular follicle-stimulating hormone (FSH) levels >12 mIU/ml have reduced response to follicular stimulation for in vitro fertilization (IVF) in a following month, in spite of normal FSH levels.

Materials and methods: In a 3-year period from January 1996 to December 1998, 303 women aged 38 years and above and/or who had previously responded poorly to superovulation for IVF gave blood samples for FSH, luteinizing hormone (LH), and estradiol (E2) on day 2 of menstruation before commencing treatment.

Results: In 117 (38.6%) of these women, FSH levels were >12 mIU/ml (range 12–114 mIU/ml). Sixty-six of these women gave a further 130 blood samples for FSH measurement in the following months. Seventy-eight (60.0%) of the tests showed raised FSH value >12 mIU/ml. Thirty women whose repeat FSH levels were <12 mIU/ml underwent 41 IVF cycles (group 1). Sixty-three other women, older than 38 and/or who had a poor response to superovulation previously and whose FSH levels were <12 mIU/ml, served as the control group (group II). There were no differences in the responses to superovulation and delivery rates between the two groups (14.6% vs. 12.7%).

Conclusions: Women whose early follicular phase FSH levels were raised >12 mIU/ml had an increased risk (>50%) that in subsequent cycles levels would remain raised, and it was not possible to predict which individuals would have favorable FSH levels. If the cycle day 2 FSH level returns to a “normal” level of <12 mIU/ml, women aged 40 and above had substantial cycle cancellation rates (43%), but patients who achieved the stage of embryo transfer had a good chance of conceiving, regardless of their age.

Keywords: follicle-stimulating hormone, ovulation induction, ovarian reserve, in vitro fertilization, treatment outcome

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