Best investigation for acute cholecystitis is
C i.e. HIDA Scan HIDA Scan & PIPIDA are best test to rule out acute cholecystitisQ with.--400% negative predictive value. It can be pseudo positive in chronic malnutrition, & Parenteral nutrition & alcoholic liver disease.
ERCP
Oral cholecystography (OCG)
HIDA scan
IV cholangiography