Severity of vaginal wall prolapse can be graded by the Pelvic Organ Prolapse-Quantification (POP-Q) system: Stage 0: No prolapse Stage I: Most distal prolapse is more than 1 cm above the hymen Stage II: Most distal prolapse is between 1 cm above and 1 cm below the hymen Stage III: Most distal prolapse is more than 1 cm below hymen but 2 cm shorter than total vaginal length Stage IV: Complete eversion The POP-Q system is recommended by professional organizations because it is a reliable and reproducible classification system that is based on predefined anatomic landmarks.