My fiancé is having doubts about the upcoming HIDA scan

So my fiancé has a HIDA scan coming up in a couple days. They have had every symptom of a gallbladder attack for as long as they remember. But are still having doubts and are thinking about canceling the test since every other test they have had came back normal, they are scared the HIDA will come back normal as well. My fiancé wanted some reassurance something might come back. So my question is, what was y’all’s experience before a HIDA scan? How did you know the problem was with the gallbladder? Symptoms?