Table 1. The staging system considers the morphological appearance, number, location, and size of the endometriotic lesion and assigns scores according to these factors.

The higher the score, the greater the severity of endometriosis.

THE REVISED AMERICAN SOCIETY FOR REPRODUCTIVE MEDICINE CRITERIA FOR ENDOMETRIOSIS STAGING
STAGE I (MINIMAL)	POINT SCORE BETWEEN 1-5
STAGE II (MILD)	POINT SCORE BETWEEN 6-15
STAGE III (MODERATE)	POINT SCORE BETWEEN 16-40
STAGE IV (SEVERE)	POINT SCORE BETWEEN > 40