Hi,
Would volume be a better guide? There have been papers looking at ultrasound volume measurements in humans and Lisciandro has looked at it in veterinary patients. I think it’s in its infancy though.
J Vet Emerg Crit Care (San Antonio). 2017 Nov;27(6):713-717. doi: 10.1111/vec.12670. Epub 2017 Sep 26.
Use of urinary bladder measurements from a point-of-care cysto-colic ultrasonographic view to estimate urinary bladder volume in dogs and cats.
Lisciandro GR1, Fosgate GT2.
