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Table 1 Gallbladder function classification (fat meal test)

From: Endoscopic ultrasound-assisted transmural cholecystoduodenostomy or cholecystogastrostomy as a bridge for per-oral cholecystoscopy therapy using double-flanged fully covered metal stent

Grade Empty 30 min 60 min 90 min
I Well-filling cyst of normal size and shape obvious >1/2 >3/4
II Mild changes in the morphology of cyst mild >1/3 >1/3
III Gallbladder shrinkage and wall thickening (4–5 mm) no <1/3 <1/3
IV Atrophy of the cyst no no no