TABLE 1.

POP-Q classification and staging criteria.

Stage	Criteria
0	There is no prolapse, and Aa, Ba, Ap, and Bp are measured at −3 cm, and point C is between −tvl and −(tvl-2) cm
I	The furthest point of prolapse is within the vagina, located within a range of −3 to −1 cm from the hymen
II	The furthest point of prolapse is within a range of 1 to −1 cm from the edge of the hymen
III	The furthest point of prolapse is outside of the hymen, with a distance ranging from +1 to (tvl-2) cm from the edge of the hymen
IV	The lower genital tract is completely or almost completely protruding outside the hymen, and the furthest point of prolapse is ≥(tvl-2) cm

Note: tvl: The total length from the top of the vagina to the edge of the hymen when c and d are in their normal positions (range 10 cm–12 cm).