Gallbladder Wall Measurements

Answer the age old question
Gallbladder measurements in Transverse or Longitudinal Plane?

Depending on where you trained and who you trained with, you may have a different approach to gallbladder wall measurements than your colleagues. That age old question that has probably been around as long as sound waves... do you measure the gallbladder wall in a transverse or longitudinal plane? What is your protocol and why?