Ovarian Volume on Ultrasonography

 

ovarian volume in cubic centimeters =

= 0.5 * ((longitudinal diameter in cm) * (anteroposterior diameter in cm) * (transverse diameter in cm))

 

This formula is a simplification of the equation for volume of an ellipsoid:

 

volume of an ellipsoid in cubic centimeters =

= 4 / 3 * π * ((longitudinal diameter in cm) / 2) * ((anteroposterior diameter in cm) / 2) * ((transverse diameter in cm) / 2)

 

Factors affecting the estimate:

(1) number and volume of cortical cysts

(2) corpora lutea

(3) extensive adhesions

(4) irregularities in shape or surface

 

The volume reported includes the follicular cysts, but the presence of large or increased numbers should be duly noted.

Age	Reference Volumes (Fried)
< 5 years	< 1 mL
5 – 9 years (premenarche)	3.0 mL (average)
menarche	4.0 mL (average) but may reach 6.5 mL
teenagers and young adults	may reach 14 mL
childbearing years	9.8 mL
postmenopausal	5.8 mL, but small or undetectable ovaries are not unusual