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Ovarian Hyperstimulation Syndrome

Statistics for Ovarian Hyperstimulation Syndrome

The statistics on ovarian hyperstimulation syndrome (OHSS) show it to be a relatively rare condition. OHSS occurs from use of human chorionic gonadotropin (hCG) given during ovulation cycles to stimulate production of eggs. The treatment may be repeated during successive cycles until pregnancy is achieved.

Facts on OHSS include:

  • Severe OHSS occurs in about 1.4 percent of all hCG cycles
  • The risk for each woman is 2.3 percent over an average 3.3 cycles
  • OHSS affects approximately 6.000 women each year (based on 430,000 in vitro fertilization cycles in the U.S. and Europe)
  • Several cases of fatality have been reported, but death from OHSS is very rare
  • More than half of patients require only one procedure to remove excess fluid from the abdomen
  • A small number of patients require hospitalization

Locations for Ovarian Hyperstimulation Syndrome