title: Significance of premature progesterone rise in IVF.
abstract: OBJECTIVE
  The current review will focus on the cause of premature progesterone and its impact on endometrial receptivity and endometrial gene expression.
  
  
  RESULTS
  Premature progesterone rise in stimulated IVF cycles seems to have a negative impact on the pregnancy rate. The current knowledge on the cause of a premature progesterone rise is still limited; however, it seems that overstimulating the ovaries during the end of the follicular phase will lead to a premature progesterone rise. The negative impact on the outcome is mainly due to reduced endometrial receptivity as can be seen in the altered endometrial gene expression.
  
  
  CONCLUSIONS
  Future studies should focus on how ovarian stimulation can be tailored according to individual requirements of the patients, aiming on preventing a possible progesterone rise during follicular phase of stimulated IVF cycles.
authors: aNova IVI Fertility, Abu Dhabi, UAE bReproductive Immunology and Implantation, Vrije Universiteit Brussel, Brussel, Belgium.
authors: Human M
authors: HM
authors: Fatemi
authors: Inge
authors: I
authors: Van Vaerenbergh
mesh_terms: D005260:Female; D005307:Fertilization in Vitro / Q000379:methods; D005640:Follicle Stimulating Hormone / Q000097:blood; D005498:Follicular Phase / Q000502:physiology*; D006801:Humans; D007247:Infertility, Female / Q000097:blood / Q000503:physiopathology / Q000628:therapy*; D007986:Luteinizing Hormone / Q000097:blood; D010062:Ovulation Induction / Q000379:methods; D011247:Pregnancy; D018873:Pregnancy Rate; D011374:Progesterone / Q000097:blood*; D015854:Up-Regulation
chemical_list: D011374:Progesterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone