The body can't tell the difference between HIDA and bilirubin. So, if you give Tc-labelled HIDA then you will get a map of the entire biliary tree within 1/2 an hour.
If you don't see the gallbladder then it means the cystic duct is blocked (i.e. acute cholecystitis).
If you don't see the bowel then it means the CHD or CBD is blocked. How do you know which it is? Simple - if you see only tracer in the liver and the squiggly lines over the liver then it never got to the CBD, which is the straight line heading downwards at 6 o'clock just outside the liver.
NB: The way the liver bit is reported is that if you see the liver looking like a liver then you simply say "normal liver uptake".
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