Precocious puberty: what pelvic ultrasound adds to the diagnosis

Ovarian volume, uterine length, and the corpus-to-cervix ratio are pelvic parameters that help differentiate central precocious puberty from benign variants, complementing the GnRH stimulation test.

When puberty signs appear before age 8 in girls, pelvic ultrasound provides objective parameters — uterine volume, ovarian volume, uterine corpus-to-cervix ratio, and follicle count — that complement clinical assessment and the GnRH stimulation test.

The parameters with the strongest discriminative value

Ovarian volume has proven, across several series, to be the single most consistent parameter for identifying central precocious puberty, with age-specific cutoff points. Uterine volume follows this trend, typically larger in girls with central precocious puberty than in isolated thelarche.

Use in follow-up, not just diagnosis

Beyond aiding the initial differential diagnosis, serial assessment of uterine and ovarian volume over time helps track the response to GnRH analog treatment.