I had a hida scan that came back at 74%. is that too low for a hyperactive gallbladder? i'm experiencing pain under right rib, nausea, and vomiting

Could be other: Among the causes for those symptoms are gallbladder disease (not enough info given to say you have that) as well as gut/stomach issues including ulcers, celiac disease, other. Get checked for other things.

Normal: I assume that you are referring to your gallbladder (gb) ejection fraction (ef) . This is calculated after the gb is filled with radio tracer and after a cholecystokinetic drug is administered (or fatty meal). An ef of less than 35-40% is considered abnormal. Normal ef are greater than 50% with a normal mean of 75% an sd of 20%.

Probably not.: Hyperkinetic or hyperactive gallbladder is not generally accepted as a diagnosis. A small group of patients (63) was symptomatic with cck infusion with greater than 80% ejection fraction. 28 of these patients underwent removal of gall bladder. 97% of these 28 patients showed improvement in symptoms following surgery. More prospective and retrospective studies needed.To substantiate the findings.

74% is normal: Hida scan with cck augmentation normal range is typically greater than 50%, with 35% to 50% being "borderline" and less than 35% being abnormal. The gallbladder should contract with cck (an analog of a hormone that causes gallbladder emptying) if it is responding/working normally. The hida portion examines the liver cells that make bile and the bile ducts to make sure they are not blocked.