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A staging system has been developed by the American Society of Reproductive Medicine (formerly the American Fertility Society). The stages are classified by level of severity and are listed as the following:
The stage of endometriosis is based on the location, amount, depth, and size of the endometrial implants. Specific criteria include:
The stage of the endometriosis does not necessarily reflect the level of pain experienced, risk of infertility, or symptoms present. For example, it is possible for a woman in Stage I to be in tremendous pain, while a woman in Stage IV may be asymptomatic.
In addition, women with impaired fertility who receive treatment during the first two stages of the disease have the greatest chance of regaining their ability to become pregnant following treatment.