Synopsis
Use abdominal ultrasound appropriately for gallbladder and biliary disease, interpret stones, wall and duct findings with symptoms and blood tests, and escalate negative or equivocal studies without delaying sepsis care.
- For suspected gallstone disease, NICE recommends liver function tests and abdominal ultrasound as the initial diagnostic pair.
- Ultrasound is strong for gallbladder stones and biliary dilatation but may miss distal common bile duct stones or be limited by bowel gas and habitus.
- Diagnose acute cholecystitis from the combined clinical, laboratory and sonographic picture, not wall thickness alone.
Key red flags
Hypotension, confusion, rising lactate or organ dysfunction with suspected biliary obstruction requires emergency source-control planning.
A normal ultrasound does not exclude early cholecystitis, small or distal common bile duct stones, pancreatitis or another acute abdomen.
Gallbladder wall thickening and pericholecystic fluid are nonspecific in ascites, hepatitis, heart failure and critical illness.
Acalculous cholecystitis in a critically ill patient may be subtle and requires early specialist discussion despite equivocal findings.
Stones plus focal sonographic tenderness, distension, wall thickening or pericholecystic fluid supports inflammation in the right clinical context.
Biliary obstruction with infection can progress to hypotension, confusion and organ failure and requires urgent drainage planning.
Investigation priorities
Identify gallbladder stones, inflammation and biliary dilatation without ionising radiation.
Management branches
A stable adult has episodic right upper quadrant pain, cholestatic LFTs and no fever.
- Context: define pain timing, jaundice, fever, pancreatitis features, previous surgery and current physiology.
- Reasoning: obtain ultrasound and LFTs together; examine stones, gallbladder inflammation and duct calibre while noting visualisation limits.