Gallstones & biliary colic: the AU general practice approach

What gallstones actually are

Gallstones form inside the gallbladder — a small sac beneath the liver that stores bile. Most stones (~80% in Western populations) are cholesterol stones, which develop when bile becomes supersaturated with cholesterol, particularly in the context of gallbladder hypomotility. Pigment stones (black and brown) account for the remainder; they are associated with haemolytic anaemia, cirrhosis, and biliary infection.

Gallstones affect roughly 10–15% of Australian adults and are 2–3 times more common in women than in men. The classical risk profile — the “five Fs”: Female, Forty, Fertile, Fat, Family history — captures the most prevalent group, but eTG and NICE CG188 identify additional contributors: rapid weight loss or bariatric surgery, type 2 diabetes, metabolic-associated steatotic liver disease (MASLD), oestrogen therapy (oral contraceptive pill, hormone replacement therapy), prolonged fasting or total parenteral nutrition, ileal disease or resection (Crohn’s disease), haemolytic anaemias, cirrhosis, and certain drugs (ceftriaxone, octreotide, fibrates).

The critical insight that guides general practice management is this: most gallstones are asymptomatic and will stay that way. The annual risk of developing symptoms is only about 1–2%, meaning roughly 80% of people with incidentally discovered gallstones remain symptom-free over 20 years. This is why observation — not surgery — is the default for asymptomatic stones.

A. Core clinical — the AU general-practice framework

The clinical spectrum

Asymptomatic gallstones (~80% of all gallstone-positive adults): Found incidentally on ultrasound or CT. Per eTG and RACGP guidance: observe rather than refer for surgery in most cases. Exceptions exist (see Section B).

Biliary colic: The typical symptomatic presentation. Episodic right upper quadrant (RUQ) or epigastric pain lasting ≥30 minutes (often several hours), triggered by fatty or large meals. The pain is constant, not wave-like despite the name. Radiation to the right shoulder or scapula is common; nausea and vomiting frequently accompany it. Murphy sign is negative. Blood tests — FBC, CRP, LFTs, lipase — are normal during an uncomplicated episode.

Acute cholecystitis: A stone impacted in the cystic duct causes gallbladder wall inflammation. Pain persists beyond 4–6 hours, fever develops, and Murphy sign is positive (sudden cessation of inhalation when pressure is applied beneath the right costal margin). Raised white cell count and CRP confirm systemic inflammation. Tokyo Guidelines 2018 (TG18) grade cholecystitis severity as mild, moderate, or severe, which guides the urgency of surgical intervention.

Choledocholithiasis (common bile duct stone): A stone migrates from the gallbladder into the common bile duct, causing obstructive jaundice — raised bilirubin, alkaline phosphatase, and GGT disproportionate to AST/ALT. Pale stools, dark urine, and pruritus accompany jaundice. This pattern also indicates risk of ascending cholangitis and gallstone pancreatitis.

Acute cholangitis: Bacterial infection of the obstructed biliary tree. Charcot’s triad — RUQ pain, jaundice, fever — is the diagnostic hallmark, present in about 70% of cases. Reynolds’ pentad adds septic shock and altered consciousness, indicating severe disease. This is a medical emergency.

Gallstone pancreatitis: A stone obstructs the ampulla of Vater, triggering pancreatic inflammation. Epigastric pain radiating to the back, raised lipase, nausea and vomiting. The PONCHO trial (Lancet 2015) established same-admission cholecystectomy as the standard of care for mild gallstone pancreatitis.

Investigations

eTG recommends the following workup for suspected symptomatic gallstones:

• Bloods: FBC, CRP, LFTs (bilirubin, ALP, GGT — key for detecting choledocholithiasis), lipase, INR. β-hCG in women of reproductive age. Urinalysis.
• Transabdominal ultrasound — first-line imaging; sensitivity ~95% for gallstones, but only ~50% for common bile duct (CBD) stones. Detects gallbladder wall thickening, pericholecystic fluid, and sonographic Murphy sign in cholecystitis.
• MRCP (magnetic resonance cholangiopancreatography) — sensitivity ~95% for CBD stones; non-invasive. Indicated when CBD stone probability is intermediate (raised LFTs, dilated CBD on ultrasound, age >55).
• CT abdomen — for atypical presentations, or when complications (perforation, emphysematous cholecystitis, gallstone ileus) are suspected.
• ERCP (endoscopic retrograde cholangiopancreatography) — therapeutic as well as diagnostic; for confirmed or high-probability CBD stones.

Risk-stratifying CBD stones:

• High probability (stone on ultrasound, cholangitis, bilirubin >68 μmol/L): proceed to ERCP directly
• Intermediate probability (raised ALP/GGT, dilated CBD, age >55): MRCP or EUS first to avoid unnecessary ERCP
• Low probability (normal LFTs, normal CBD on ultrasound): cholecystectomy with or without intraoperative cholangiogram

B. Evidence — when to observe and when to operate

The case for observation in asymptomatic gallstones

NICE CG188, eTG, and the Gastroenterological Society of Australia (GESA) converge: prophylactic cholecystectomy is not justified for asymptomatic gallstones in most people. The annual symptom-development rate of 1–2% means the operative risk of elective cholecystectomy outweighs the benefit for the vast majority who will remain asymptomatic.

Limited exceptions where prophylactic surgery is considered: gallbladder polyps >10 mm (malignant potential), porcelain gallbladder where cancer risk has been specifically assessed by a specialist, stones >30 mm in conjunction with other risk factors, sickle cell disease (atypical presentation makes monitoring unreliable), and candidates for bariatric surgery in some centres (performed simultaneously — debated).

Early versus delayed surgery for cholecystitis

Multiple randomised trials and a Cochrane review have established that early laparoscopic cholecystectomy within one week of acute cholecystitis reduces overall complications, length of hospital stay, and readmission rates compared with delayed surgery at 6–8 weeks. The TG18 Tokyo Guidelines codify this: early surgery is the current standard of care for mild-to-moderate acute cholecystitis.

Conversion from laparoscopic to open cholecystectomy occurs in approximately 5% of cases — more often when surgery is delayed and inflammation has worsened.

Same-admission cholecystectomy for gallstone pancreatitis

The PONCHO trial (Lancet 2015, n=266) randomised patients with mild gallstone pancreatitis to same-admission cholecystectomy versus interval surgery at six weeks. Same-admission surgery reduced the composite of recurrent biliary events and recurrent pancreatitis by approximately half. Current Australian and international guidelines uniformly recommend same-admission cholecystectomy for mild gallstone pancreatitis before discharge.

Non-surgical alternatives — limited role

Ursodeoxycholic acid (UDCA) dissolves small, floating cholesterol gallstones in non-surgical candidates. Dissolution rates are approximately 50% over months to years, and recurrence after stopping occurs in about half of cases within five years. Not a first-line option for typical symptomatic patients. UDCA prophylaxis during rapid weight loss or post-bariatric surgery reduces new stone formation and is discussed in eTG as a consideration for high-risk patients.

C. Complications and the danger signs

Acute cholangitis — the hepatobiliary emergency

Cholangitis combines biliary obstruction with ascending bacterial infection. Charcot’s triad (RUQ pain + jaundice + fever) is diagnostic in most cases; Reynolds’ pentad (adding septic shock and altered consciousness) signals severe, life-threatening disease.

Management per eTG: immediate hospital admission, IV fluids, IV broad-spectrum antibiotics (piperacillin-tazobactam, or ceftriaxone plus metronidazole), and urgent biliary decompression within 24–48 hours. Decompression is usually achieved via ERCP + sphincterotomy + stone extraction; percutaneous transhepatic biliary drainage (PTBD) if ERCP is unavailable. Cholecystectomy follows after clinical stabilisation.

Acalculous cholecystitis

Approximately 5–10% of cholecystitis cases have no demonstrable gallstone. This form occurs in critically ill patients — post-major surgery, prolonged ICU admission, total parenteral nutrition — through gallbladder ischaemia and hypomotility. HIDA cholescintigraphy is the diagnostic test of choice when ultrasound is non-diagnostic. Management: percutaneous cholecystostomy for drainage in unstable patients, followed by delayed cholecystectomy once stabilised.

Gallstone ileus

A rare complication, predominantly in elderly patients: a large gallstone erodes through the gallbladder into the duodenum via a cholecysto-enteric fistula, migrates distally, and impacts in the terminal ileum, causing small bowel obstruction. Rigler’s triad on imaging — pneumobilia (air in the biliary tree), small bowel obstruction, and an ectopic calcified stone — is diagnostic. Requires surgical management.

Recognising the obstructive LFT pattern

When choledocholithiasis is suspected, the pattern of liver enzyme abnormality is informative. A bile duct stone produces a predominantly obstructive pattern: disproportionate elevation of bilirubin, ALP, and GGT relative to AST and ALT. A hepatocellular-predominant pattern (ALT markedly elevated relative to ALP) instead suggests hepatitis, MASLD, or drug-induced liver injury.

D. Australian operations

Referral pathways

General or hepatobiliary surgeon: Referral is appropriate for any patient with symptomatic gallstones confirmed on ultrasound who has recurrent biliary colic, a first episode of acute cholecystitis, or gallstone pancreatitis. Routine outpatient referral is sufficient for uncomplicated biliary colic; urgent or semi-urgent referral for recent cholecystitis. The Royal Australasian College of Surgeons (RACS) oversees surgical credentialling and provides patient information on cholecystectomy.

Gastroenterologist: For ERCP and complex biliary duct evaluation. The Gastroenterological Society of Australia (GESA) provides specialty-level guidance.

Emergency department: For acute cholecystitis, cholangitis, gallstone pancreatitis, or any patient with RUQ pain and fever who cannot be assessed same-day in general practice.

MBS items in general practice

Standard consultations (MBS items 23, 36, 44) cover the clinical assessment. RUQ or abdominal ultrasound (MBS 55028/55036) is first-line imaging. MRCP (MBS 63507) is appropriate for intermediate-probability CBD stones. LFT, FBC, CRP, and lipase are covered under standard pathology items. The 75+ Health Assessment (MBS 707) includes abdominal examination and is relevant when gallstone disease is suspected in older patients.

PBS prescribing

Ursodeoxycholic acid (Ursofalk) is on the general PBS schedule for primary biliary cholangitis; its use for cholesterol stone dissolution is off-label. Antibiotics for cholecystitis (cephalexin for mild outpatient-managed cases per eTG; piperacillin-tazobactam or ceftriaxone for admitted patients) are on the general schedule. Analgesia for biliary colic: paracetamol and anti-inflammatories on the general schedule; opioids under standard Schedule 8 rules with SafeScript monitoring where applicable.

Lifestyle and modifiable risk

Gradual weight loss (not rapid) reduces new stone formation and is appropriate to discuss as part of metabolic health management. A Mediterranean or lower-fat dietary pattern may reduce the frequency of biliary colic episodes. Avoiding prolonged fasting and maintaining physical activity support healthy bile flow. Rapid weight loss — including very-low-calorie diets or post-bariatric surgery — paradoxically increases gallstone formation; UDCA prophylaxis is one option discussed with the operating bariatric team.

E. Special populations

Pregnancy

Gallstone disease is more prevalent in pregnancy due to oestrogen-driven cholesterol supersaturation and progesterone-related gallbladder hypomotility. Conservative management is preferred in the first trimester to avoid the risks of general anaesthesia. When surgery becomes unavoidable — persistent cholecystitis, gallstone pancreatitis not resolving with conservative care — laparoscopic cholecystectomy in the second trimester is the safest surgical window. Specialist obstetric and hepatobiliary input is essential for decision-making.

Elderly and frail patients

Older adults and those who are frail may present atypically: absent fever despite significant cholecystitis, vague abdominal discomfort rather than sharp pain, or minimal peritoneal signs despite perforation risk. A lower threshold for imaging (ultrasound or CT) is appropriate. Surgical risk assessment should incorporate frailty score, cardiorespiratory reserve, and anticoagulation status. Percutaneous cholecystostomy is a bridging option for patients who are too unwell for immediate surgery.

People with type 2 diabetes

Autonomic neuropathy in long-standing type 2 diabetes can blunt the pain response to cholecystitis, leading to later and more complicated presentations. A lower threshold for imaging in someone with right-sided abdominal symptoms and a diabetes history is warranted. Perioperative glycaemic management requires coordination with the GP and, where appropriate, endocrinology.

After bariatric surgery

Rapid weight loss following bariatric surgery is one of the highest-risk scenarios for new gallstone formation. Some bariatric centres offer simultaneous cholecystectomy; others use UDCA prophylaxis for 6 months postoperatively. Symptomatic gallstones arising after bariatric surgery are managed with standard laparoscopic cholecystectomy, though adhesions from prior surgery can increase operative complexity.

When to escalate

Refer same-day to emergency or arrange urgent specialist review when:

• Fever with RUQ pain — acute cholecystitis or cholangitis; requires hospital admission, IV antibiotics, and imaging
• Jaundice, pale stools, or dark urine — bile duct stone; requires MRCP or urgent ERCP assessment
• Charcot’s triad (fever + jaundice + RUQ pain) — cholangitis; call emergency services or direct to ED immediately
• Severe pain radiating to the back with raised lipase — gallstone pancreatitis; hospital admission and surgical review
• Inability to maintain oral intake from pain and vomiting — requires IV fluids and urgent surgical assessment
• Signs of perforation — rigid abdomen, haemodynamic instability, peritonitis — immediate emergency care

Routine outpatient surgical referral is appropriate for patients with recurrent biliary colic confirmed on ultrasound who have no current complications.

What this article is and is not

This article is general health information drawn from current Australian general practice guidelines — Therapeutic Guidelines (eTG), RACGP, GESA, RACS, Tokyo Guidelines 2018, and NICE CG188 — supplemented by the PONCHO trial (Lancet 2015) and Cochrane data. It is not personal medical advice and does not create a doctor–patient relationship. Decisions about whether and when to proceed to surgery, and which investigations are appropriate, depend on individual clinical circumstances discussed with your GP and treating surgeon.

Australian consumer resources: HealthDirect — Gallstones, Better Health Channel — Gallstones.

For abdominal emergencies — severe pain, fever, jaundice, or symptoms that are worsening rapidly — call triple zero (000) or go directly to your nearest emergency department.

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Sources cited

1. Therapeutic Guidelines — Biliary disease
2. RACGP — Gallstone disease (AFP)
3. GESA — Biliary disease
4. Royal Australasian College of Surgeons (RACS)
5. Tokyo Guidelines 2018 — Acute cholangitis and cholecystitis
6. PONCHO trial — Lancet 2015
7. Cochrane — Early vs delayed cholecystectomy
8. NICE CG188 — Gallstone disease
9. HealthDirect — Gallstones
10. Better Health Channel — Gallstones