Human Reproduction, Vol. 17, No. 12, 3129-3137,
December 2002
© 2002 European Society of Human Reproduction and Embryology
Effects of exogenous LH administration during ovarian stimulation of pituitary down-regulated young oocyte donors on oocyte yield and developmental competence
1 MAR&Gen, Molecular Assisted Reproduction and Genetics, Gracia 36, 18002 Granada, and 2 Department of Biochemistry and Molecular Biology, University of Granada, Granada, Spain
BACKGROUND: The role of exogenous LH supplementation in ovarian stimulation is a matter of debate. Here we evaluate the impact of exogenous LH on oocyte yield and developmental competence in an oocyte donation programme. METHODS: Oocyte donors were randomized (computer-generated randomization list) to groups stimulated with FSH alone or with a combination of FSH and LH after pituitary down-regulation with a GnRH agonist administered in the mid-luteal phase. RESULTS: In donors with deep suppression of pituitary LH (<1 IU/l) before the beginning of ovarian stimulation, the inclusion of exogenous LH resulted in an increase in the number of mature oocytes and good-quality zygotes and embryos as well as higher implantation rates when compared with stimulation with FSH alone. In contrast, the inclusion of exogenous LH in the stimulation of donors with pre-stimulation serum LH of 
1 IU/l impaired embryo morphology and lowered the implantation rate, although it increased the number of metaphase II oocytes. CONCLUSIONS: The inclusion of exogenous LH to the ovarian stimulation protocol can have beneficial or detrimental effects on oocyte yield and quality, depending on the level of endogenous LH. These data support the concept of a `window' for LH requirement in ovarian stimulation.
Key words: LH/oocyte developmental competence/oocyte donation/ovarian stimulation/pituitary down-regulation
3 To whom correspondence should be addressed. E-mail: cmendoza{at}ugr.es
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