We're redesigning our website - we're keen for you to try it so we can hear your views on how it can be improved ahead of the official launch. Head on over to the HFEA BETA to see how it is shaping up.


  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
  7. G
  8. H
  9. I
  10. J
  11. K
  12. L
  13. M
  14. N
  15. O
  16. P
  17. Q
  18. R
  19. S
  20. T
  21. U
  22. V
  23. W
  24. X
  25. Y
  26. Z


Oestrogen/Oestradiol: Female sex hormone produced by the ovary.  Levels fluctuate during the menstrual cycle.

Oligozoospermia: Low sperm count - less than twenty million sperm per millilitre. It can be severe - less than five million sperm per millilitre. 

Oocyte: The female gamete (egg).

Ovaries: The female reproductive organ in which oocytes are produced from pre-existing germ cells. The ovaries also produce hormones.

Ovarian Hyperstimulation Syndrome (OHSS): A serious complication following stimulation of the ovaries with gonadotrophin drugs. 

Ovulation: The release of an egg from a follicle in the ovary. 

Ovum: The female gamete (egg).

Back to top

Page last updated: 18 July 2012