Had a hidascan today and wonder why they didn't do second part.

[Gmanmom]

I've been having issues with my gallbladder so decided to have it checked out.  My husband had it done a while ago and they did an ultrasound then the Hida scan.  In his procedure they injected the contrast, scan him for an hour, then gave a high fat ensure and scanned again for an hour.  But in mine, they did ultrasound, Hida scan with contrast, scan for an hour, then another hour of scanning but no ensure.  The tech did comment that he hope it would show in the second round.  I don't know what that means or why I would drink the liquid.  Any insight?