title: Relationship between serum human chorionic gonadotrophin levels and body mass index in women undergoing in vitro fertilisation cycles.
abstract: OBJECTIVE
  To ascertain if serum concentrations following injection of human chorionic gonadotropin (hCG) influenced the outcome of in vitro fertilisation (IVF) treatment and correlated to body mass index (BMI).
  
  
  METHODS
  A prospective study conducted with the participation of 149 women undergoing IVF and/or intracytoplasmic sperm injection (ICSI) treatment at the regional IVF Unit in Liverpool, UK. The BMI of each individual was calculated and serum hCG concentrations were measured at 12 and 36 h following a subcutaneously (SC) injection of 5000 IU hCG. The main outcome measures were fertilisation rate and biochemical pregnancy rate.
  
  
  RESULTS
  No correlation was found between serum hCG levels at 12 and 36 h with the number of oocytes retrieved or the number of oocytes fertilised. Furthermore, there was no correlation between BMI and hCG levels at 12 and 36 h following administration (Pearson's correlation coefficient: -0.23, -0.24, respectively).
  
  
  CONCLUSIONS
  Our results suggest that the serum concentrations of hCG do not influence IVF outcome and that the serum levels of hCG achieved following administration do not correlate with the individual's BMI. Serum hCG concentration also does not correlate with number of oocytes collected or fertilisation rate.
authors.affiliation: The Hewitt Centre for Reproductive Medicine, Liverpool Women's Hospital, Crown Street, Liverpool L8 7SS, UK.
authors.forename: Petros
authors.initials: P
authors.lastname: Stefanis
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Das
authors.forename: Emil
authors.initials: E
authors.lastname: Barsoum-Derias
authors.forename: Charles
authors.initials: C
authors.lastname: Kingsland
authors.forename: Iwan
authors.initials: I
authors.lastname: Lewis-Jones
authors.forename: Rafet
authors.initials: R
authors.lastname: Gazvani
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002064:Buserelin / Q000627:therapeutic use; D006063:Chorionic Gonadotropin / Q000097:blood* / Q000493:pharmacokinetics*; D005260:Female; D005300:Fertility Agents, Female / Q000627:therapeutic use; D005307:Fertilization in Vitro; D006801:Humans; D010062:Ovulation Induction / Q000379:methods; D011247:Pregnancy; D011256:Pregnancy Outcome; D011446:Prospective Studies; D016896:Treatment Outcome
chemical_list: D006063:Chorionic Gonadotropin; D005300:Fertility Agents, Female; D002064:Buserelin