There are many medical implications for anyone involved with surrogacy. The success rate for a healthy pregnancy achieved through surrogate mothers varies greatly. There are, according to many in the field, no reliable statistics for many aspects of surrogacy.
While one may be able to research the success rate of pregnancy achieved through IVF or artificial insemination, there are no widely respected statistics on live, healthy births achieved through either procedure. Perhaps, this is due to the many factors that can affect the success rate of pregnancy achieved through either type of surrogacy.
Each procedure has different success rates and risks associated with it. In addition to procedural differences, there are other factors that affect success rate. Age, overall health and stress can all affect pregnancy success rates in any circumstance, but more so in surrogacy. Younger, fitter people are more likely to produce healthy eggs and sperm. In addition, a younger, fitter surrogate is more likely to achieve a successful pregnancy. In any case, stress is associated with reduced success rates.