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EM TopicsProcedural & diagnostic ED skills

EM · Procedural & diagnostic ED skills

Point-of-care ultrasound: biliary and renal (and the incidental AAA)

Also known as POCUS biliary · POCUS renal · Point-of-care ultrasound right upper quadrant · Bedside gallbladder ultrasound · Hydronephrosis ultrasound · Emergency renal ultrasound · RUQ ultrasound

Point-of-care ultrasound of the biliary tree, the kidneys and the incidental abdominal aortic aneurysm — the right-upper-quadrant scan for gallstones (hyperechoic with acoustic shadowing), gallbladder wall thickening over 3 millimetres, the sonographic Murphy sign and the common bile duct over 7 millimetres; the renal scan for hydronephrosis (graded mild to severe), stones and cysts; and the aorta measured in every older flank-pain patient to catch the aneurysm that masquerades as colic. Technique with the curvilinear probe and an appropriate depth; the differentials (the non-visualised post-prandial gallbladder, bowel gas, ascites); and the diagnostic accuracy (POCUS rules cholecystitis in, it does not rule it out). ACEM-primary, globally tagged.

medium9 referencesUpdated 26 July 202613 min readVerification in progress

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Target exams

ACEMFRCEMABEMFRCPCCCFPEMEBEEM

Red flags

  • An older patient with apparent renal colic has a ruptured abdominal aortic aneurysm until the aorta is measured — measure the aorta on every renal and biliary scan of the patient over 50
  • A non-visualised gallbladder is not a negative scan — a contracted post-prandial gallbladder, bowel gas and deep habitus all hide the organ, and a negative bedside scan never rules out cholecystitis
  • Hydronephrosis on a bedside scan neither confirms a stone nor excludes one — the sensitivity is around 70 per cent and a stone lodged without upstream dilation reads falsely negative
  • Fever with an obstructed, hydronephrotic kidney is pyonephrosis — a urological emergency needing urgent decompression, not analgesia and discharge
  • A common bile duct over 7 millimetres with jaundice and fever is ascending cholangitis — the biliary sepsis that kills within hours if the duct is not drained
On this page

Related topics

  • Biliary disease — biliary colic, acute cholecystitis and ascending cholangitis
  • Renal colic and nephrolithiasis
  • Abdominal aortic aneurysm (ruptured and intact)
  • Focused Assessment with Sonography in Trauma (FAST and E-FAST)
  • Acute abdominal pain — the emergency department approach
  • Acute pancreatitis
  • Acute kidney injury
Study tools

Your progress

Saved on this device.

Practise this topic8 MCQs with explanations

Target exams

ACEMFRCEMABEMFRCPCCCFPEMEBEEM

Red flags

  • An older patient with apparent renal colic has a ruptured abdominal aortic aneurysm until the aorta is measured — measure the aorta on every renal and biliary scan of the patient over 50
  • A non-visualised gallbladder is not a negative scan — a contracted post-prandial gallbladder, bowel gas and deep habitus all hide the organ, and a negative bedside scan never rules out cholecystitis
  • Hydronephrosis on a bedside scan neither confirms a stone nor excludes one — the sensitivity is around 70 per cent and a stone lodged without upstream dilation reads falsely negative
  • Fever with an obstructed, hydronephrotic kidney is pyonephrosis — a urological emergency needing urgent decompression, not analgesia and discharge
  • A common bile duct over 7 millimetres with jaundice and fever is ascending cholangitis — the biliary sepsis that kills within hours if the duct is not drained
The one-line answer

Bedside POCUS of the biliary tree and the kidneys answers three questions in the patient with abdominal or flank pain: is there gallbladder disease (stones with shadowing, a wall over 3 mm, the sonographic Murphy sign), is there hydronephrosis suggesting obstruction, and — the safety net that catches the lethal mimic — is there an abdominal aortic aneurysm. It is a rule-in tool: a positive scan drives the admission, but a negative scan never rules out cholecystitis, and an older flank-pain patient has an AAA until the aorta is measured.[1]

Meet the patient

A 52-year-old woman arrives at 3am with eight hours of constant right-upper-quadrant pain radiating to the scapula, nauseated and febrile at 38.6, with marked RUQ tenderness and a positive clinical Murphy sign. She ate a meal four hours ago — a detail that will distort her scan.[1]

Now picture the man in the next bay: 68, a 50-pack-year smoker, acute left loin pain radiating to the groin with macroscopic haematuria. The easy label is renal colic — and that label is exactly how a ruptured abdominal aortic aneurysm dies in the CT queue. The biliary-renal scan is built so that the same sweep that looks for the gallstone and the hydronephrosis always ends on the aorta, because the aneurysm masquerades as colic and the probe is already in the hand.[1]

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References9ShowHide
  1. [1]Wu X, Li K, Kou S, et al. The Accuracy of Point-of-Care Ultrasound in the Detection of Gallbladder Disease: A Meta-analysis. Acad Radiol, 2024.PMID 37838525
  2. [2]Ralls PW, Halls J, Lapin SA, et al. Prospective evaluation of the sonographic Murphy sign in suspected acute cholecystitis. J Clin Ultrasound, 1982.PMID 6804512
  3. [3]Bree RL. Further observations on the usefulness of the sonographic Murphy sign in the evaluation of suspected acute cholecystitis. J Clin Ultrasound, 1995.PMID 7730462
  4. [4]Yokoe M, Hata J, Takada T, et al. Tokyo Guidelines 2018: diagnostic criteria and severity grading of acute cholecystitis (with videos). J Hepatobiliary Pancreat Sci, 2018.PMID 29032636
  5. [5]Wong C, Teitge B, Ross M, et al. The Accuracy and Prognostic Value of Point-of-care Ultrasound for Nephrolithiasis in the Emergency Department: A Systematic Review and Meta-analysis. Acad Emerg Med, 2018.PMID 29427476
  6. [6]Sibley S, Roth N, Scott C, et al. Point-of-care ultrasound for the detection of hydronephrosis in emergency department patients with suspected renal colic. Ultrasound J, 2020.PMID 32507905
  7. [7]Al-Balushi A, Al-Shibli A, Al-Reesi A, et al. The Accuracy of Point-of-Care Ultrasound Performed by Emergency Physicians in Detecting Hydronephrosis in Patients with Renal Colic. Sultan Qaboos Univ Med J, 2022.PMID 36072079
  8. [8]Goldstein EL, Marcelo KR, Harjes WR, et al. The sonographic Murphy sign: does analgesia matter? Emerg Radiol, 2025.PMID 40991088
  9. [9]Beyer G, Kasprowicz F, Hannemann A, et al. Definition of age-dependent reference values for the diameter of the common bile duct and pancreatic duct on MRCP: a population-based, cross-sectional cohort study. Gut, 2023.PMID 36828626

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Related topics

  • Biliary disease — biliary colic, acute cholecystitis and ascending cholangitis
  • Renal colic and nephrolithiasis
  • Abdominal aortic aneurysm (ruptured and intact)
  • Focused Assessment with Sonography in Trauma (FAST and E-FAST)
  • Acute abdominal pain — the emergency department approach
  • Acute pancreatitis
  • Acute kidney injury