Rome IV Diagnostic Criteria for Functional Biliary Sphincter of Oddi Disorder (SOD)

Rome IV criteria for functional biliary sphincter of Oddi disorder (E2): biliary pain phenotype plus imaging exclusion and either enzyme elevation or bile duct dilation, not both. Educational use only.

Rome IV Functional Biliary SOD Assessment

Indicate whether each criterion is present. All biliary pain criteria and all SOD-specific criteria must be met for a positive diagnosis per Rome IV. Use in patients with suspected biliary-type sphincter of Oddi dysfunction.

Biliary pain criteria

Must include all of the following (Rome IV biliary pain definition):

SOD-specific criteria

Must include all of the following in addition to biliary pain:

Supportive criteria

The following features support the diagnosis but are not required:

Normal amylase/lipase

Normal pancreatic enzyme levels help exclude functional pancreatic sphincter of Oddi disorder (E3) and support a biliary rather than pancreatic etiology.

Abnormal sphincter of Oddi manometry (elevated basal sphincter pressure)

Elevated basal sphincter pressure (>40 mmHg) on sphincter of Oddi manometry supports the diagnosis. However, the EPISOD trial demonstrated that sphincterotomy based on manometry results did not improve outcomes, and routine manometry is no longer recommended.

Abnormal hepatobiliary scintigraphy

Delayed biliary drainage on hepatobiliary scintigraphy (e.g., HIDA scan) may support the diagnosis by demonstrating impaired bile flow through the sphincter of Oddi.

Disclaimer: The Rome IV Diagnostic Criteria for Functional Biliary Sphincter of Oddi Disorder are an educational clinical decision-support tool. They do not replace comprehensive clinical assessment, appropriate imaging, laboratory evaluation, or clinical judgment. The EPISOD trial demonstrated that endoscopic sphincterotomy did not improve outcomes for suspected SOD type III; management decisions should follow current guidelines and specialist expertise.

Rome IV Functional Biliary SOD: criteria, interpretation, and clinical context

Overview

Functional biliary sphincter of Oddi disorder (E2) is defined by the Rome IV consensus as biliary-type pain in the absence of structural pathology, with objective evidence of impaired biliary drainage (elevated liver enzymes or dilated common bile duct, but not both). It is classified under Rome IV category E (Gallbladder and Sphincter of Oddi Disorders) and is most commonly diagnosed in post-cholecystectomy patients. The Rome IV framework was published in 2016 by Cotton et al. and updated the prior Rome III classification with refined diagnostic criteria and incorporation of the EPISOD trial findings.

Biliary pain criteria (Rome IV definition)

All of the following must be present for the pain to qualify as biliary pain:

#	Criterion	Rationale
1	Located in the epigastrium and/or RUQ	Reflects visceral afferent innervation from the biliary tree via celiac plexus to T6–T9 spinal segments
2	Builds up to a steady level	Distinguishes biliary pain from colicky or crampy pain; biliary "colic" is actually a steady ache that plateaus
3	Lasts at least 30 minutes	Brief, transient pain is unlikely biliary; most episodes last 1–5 hours
4	Occurs at variable intervals (not daily)	Daily pain suggests functional dyspepsia or other chronic pain conditions rather than biliary pain
5	Severe enough to interrupt daily activities or lead to an ED visit	Ensures a clinically significant threshold; mild discomfort is not characteristic
6	Not significantly (<20%) related to bowel movements	Excludes pain patterns typical of IBS or functional bowel disorders
7	Not significantly (<20%) relieved by postural change or acid suppression	Excludes GERD and peptic disease, which respond to positional changes or antisecretory therapy

SOD-specific criteria

In addition to biliary pain, the following must also be present:

#	Criterion	Rationale
8	Absence of bile duct stones or other structural pathology	Functional biliary SOD is a diagnosis of exclusion; structural causes (stones, strictures, masses) must be ruled out by imaging (ultrasound, MRCP, or CT)
9	Elevated liver enzymes OR dilated common bile duct, but NOT both	Either finding alone suggests functional sphincter obstruction; both findings simultaneously raise concern for a structural cause (e.g., retained stone, stricture) requiring further investigation

Supportive criteria

The following features support the diagnosis but are not required:

Feature	Clinical significance
Normal amylase/lipase	Normal pancreatic enzyme levels help exclude functional pancreatic sphincter of Oddi disorder (E3), supporting a biliary rather than pancreatic etiology
Abnormal sphincter of Oddi manometry (elevated basal pressure)	Elevated basal sphincter pressure (>40 mmHg) historically used for classification; however, the EPISOD trial demonstrated that manometry-guided sphincterotomy did not improve outcomes
Abnormal hepatobiliary scintigraphy	Delayed biliary drainage on HIDA scan may provide non-invasive evidence of impaired bile flow through the sphincter of Oddi

Interpretation

Result	Clinical implication
All criteria met (functional biliary SOD)	Diagnosis of functional biliary SOD (E2) is supported. Consider hepatobiliary scintigraphy for further characterization. Per the EPISOD trial, endoscopic sphincterotomy has not been shown to improve outcomes; conservative management with reassurance, neuromodulators, and symptom-directed therapy is recommended.
Biliary pain present, SOD criteria not met	The pain pattern qualifies as biliary per Rome IV, but the SOD-specific criteria are not fulfilled. Evaluate for structural causes with imaging. If the gallbladder is intact and no structural pathology is found, consider functional gallbladder disorder (E1).
Biliary pain criteria not met	The pain pattern does not meet the Rome IV definition of biliary pain. Consider alternative diagnoses: functional dyspepsia, peptic ulcer disease, GERD, IBS, chronic pancreatitis, or musculoskeletal causes.

Rome IV Category E: Gallbladder and Sphincter of Oddi Disorders

Category	Disorder	Key distinguishing feature
E1	Functional gallbladder disorder	Gallbladder intact, no gallstones, normal liver enzymes; may have low ejection fraction on CCK-HIDA
E2	Functional biliary sphincter of Oddi disorder	Typically post-cholecystectomy; elevated liver enzymes OR dilated CBD (not both); normal amylase/lipase
E3	Functional pancreatic sphincter of Oddi disorder	Elevated amylase/lipase during pain episodes; recurrent pancreatitis may be present

Variable definitions

Elevated liver enzymes

Transient elevation of hepatic transaminases (ALT, AST) or alkaline phosphatase temporally related to episodes of biliary pain. Rome IV does not specify a precise threshold, but elevations are typically documented at ≥2× the upper limit of normal on at least two occasions during separate pain episodes.

Dilated common bile duct

Enlargement of the CBD beyond normal limits on imaging (ultrasound or MRCP). Normal CBD diameter is generally <6 mm (or <8 mm post-cholecystectomy), though age-adjusted norms may apply. In the context of functional biliary SOD, isolated CBD dilation without concurrent enzyme elevation suggests functional sphincter obstruction rather than a structural cause.

"But NOT both" rule

The Rome IV criteria specify that either elevated liver enzymes or a dilated CBD may be present, but not both simultaneously. When both findings coexist, a structural cause (retained stone, biliary stricture, or other obstruction) is more likely and should be evaluated with additional imaging (e.g., MRCP, EUS) before a functional diagnosis is made.

Sphincter of Oddi manometry

An invasive test performed during ERCP that measures basal and phasic sphincter pressures. A basal pressure >40 mmHg was historically considered diagnostic. However, the EPISOD randomized trial (Cotton et al., JAMA 2014) showed that sphincterotomy based on manometry results did not improve pain outcomes compared with sham, and routine manometry is no longer recommended for suspected SOD.

Key references

Cotton PB, Elta GH, Carter CR, Pasricha PJ, Corazziari ES. Rome IV. Gallbladder and sphincter of Oddi disorders. Gastroenterology. 2016;150(6):1420-1429.e2.
Cotton PB, Durkalski V, Romagnuolo J, et al. Effect of endoscopic sphincterotomy for suspected sphincter of Oddi dysfunction on pain-related disability following cholecystectomy: the EPISOD randomized clinical trial. JAMA. 2014;311(20):2101-2109.
Drossman DA. Functional gastrointestinal disorders: history, pathophysiology, clinical features, and Rome IV. Gastroenterology. 2016;150(6):1262-1279.e2.
Behar J, Corazziari E, Guelrud M, Hogan W, Sherman S, Toouli J. Functional gallbladder and sphincter of Oddi disorders. Gastroenterology. 2006;130(5):1498-1509.
Pop C, Purcareanu A, Purcarea M, Andronescu D. The functional sphincter of Oddi disorder. J Med Life. 2008;1(2):118-129.

Limitations

Consensus-based: The Rome IV criteria are derived from expert consensus rather than prospective validation studies with sensitivity/specificity data for functional biliary SOD.
EPISOD trial implications: The landmark EPISOD trial (2014) showed that sphincterotomy did not improve outcomes in suspected SOD type III, challenging the clinical utility of this diagnostic category and the role of invasive interventions.
Overlap with other conditions: Functional dyspepsia, IBS, and narcotic bowel syndrome may present with similar symptoms. Careful history and appropriate workup are essential.
Enzyme and imaging thresholds: Rome IV does not provide precise cutoffs for liver enzyme elevation or CBD dilation. Clinical judgment is required to determine what constitutes a clinically significant abnormality.
Post-cholecystectomy context: While E2 is typically diagnosed in post-cholecystectomy patients, the Rome IV criteria do not explicitly require prior cholecystectomy. Patients with an intact gallbladder and biliary pain should be evaluated for E1 first.

Practice caveats

Functional biliary SOD (E2) is a diagnosis of exclusion. Structural causes (retained bile duct stones, strictures, ampullary tumors) must be thoroughly ruled out with appropriate imaging before applying these criteria.
The "elevated enzymes OR dilated duct, but not both" rule is a distinctive feature of the Rome IV criteria. Both findings together should prompt evaluation for a structural obstruction rather than a functional diagnosis.
The EPISOD trial fundamentally changed the management landscape for suspected SOD. Routine ERCP with manometry and sphincterotomy is no longer recommended. Conservative management (reassurance, neuromodulators, behavioral therapy) is the preferred first-line approach.
Opioid use can cause sphincter of Oddi spasm and should be considered as a potential confounding factor in patients with suspected SOD. Evaluate for narcotic bowel syndrome in patients on chronic opioids.

What this diagnosis represents

Functional biliary sphincter of Oddi disorder (SOD) is classified under Rome IV within disorders of the gallbladder and sphincter of Oddi (category E2). It describes a syndrome of biliary-type pain in patients who do not have an adequate structural explanation on appropriate imaging, together with objective clues that implicate sphincter-level physiology rather than stones, strictures, or mass lesions.

Rome IV intentionally separates the pain phenotype (shared with other biliary disorders) from SOD-specific requirements. Meeting only the pain criteria is not enough; the additional objective pattern (enzymes versus duct caliber, with explicit exclusion rules) is what narrows the label toward functional biliary SOD rather than generic unexplained abdominal pain.

Clinical setting

Patients may present after cholecystectomy or with an intact gallbladder when imaging does not show obstructing stones. Symptoms can overlap with functional dyspepsia, gastroesophageal reflux disease, irritable bowel syndrome, and pancreatic disease. The Rome framework is a structured way to document whether the episode pattern truly resembles biliary pain and whether ancillary data fit the E2 construct.

Part one: Rome IV biliary pain criteria

All of the following seven features are required. They define a characteristic episode profile that is steady, prolonged, severe, episodic (but not daily), and poorly explained by bowel habit, posture, or acid-directed therapy.

1. Location in the epigastrium and/or right upper quadrant

Pain should be centered in the epigastrium, the right upper quadrant, or both. Diffuse or exclusively periumbilical pain without a dominant upper abdominal focus fits other entities more readily.

2. Pain builds to a steady level

The discomfort should crescendo to a plateau of relatively constant intensity. Classic “colicky” waxing and waning minute-to-minute pain is not the intended pattern, even though historical language often uses the term biliary colic. Steady pain is a deliberate discriminator.

3. Duration at least thirty minutes per episode

Episodes last half an hour or longer; many patients report one to several hours. Very brief pains are unlikely to qualify as Rome biliary pain and should prompt reconsideration of alternative mechanisms.

4. Variable intervals between episodes (not daily)

Attacks recur at irregular intervals. Pain that is daily or unremitting is atypical for this biliary pain definition and should raise suspicion for ongoing structural disease, severe functional dyspepsia, chronic pancreatitis, or centralized pain syndromes, among others.

5. Severity sufficient to interrupt activities or prompt urgent care

The episode intensity should disrupt normal activities or lead the patient to seek emergency evaluation. Mild, nagging discomfort that never reaches this threshold does not satisfy the severity requirement.

6. Not meaningfully tied to bowel movements

Rome IV uses a quantitative-style threshold in teaching materials: pain should not be significantly (typically framed as less than about twenty percent) related to defecation. A strong association with bowel movements points toward functional bowel disorders rather than a primary biliary pain syndrome.

7. Not meaningfully relieved by posture or acid suppression

Marked relief from antacids, potent acid suppression, or simple positional change suggests peptic or reflux-related pain. Lack of such relief supports a biliary-type narrative, always interpreted in clinical context.

Part two: criteria specific to functional biliary SOD

After the pain phenotype is established, two additional requirements apply. Both must be satisfied.

A. Absence of bile duct stones or other structural pathology

Appropriate cross-sectional or ductal imaging (for example ultrasound, MRCP, or CT when indicated) should not demonstrate stones in the bile duct, dominant strictures, masses, or other structural findings that explain symptoms. Functional biliary SOD remains a diagnosis of exclusion once reasonable anatomy has been assessed.

B. Elevated liver enzymes or a dilated common bile duct, but not both together

This criterion encodes a specific logic:

Either transient laboratory abnormalities (such as ALT, AST, or alkaline phosphatase) that track with pain episodes,
Or imaging evidence of a dilated common bile duct in the absence of an obvious obstructing lesion,
but not both simultaneously in a way that implies a structural obstructive process that has not been fully excluded.

When enzyme elevation and duct dilation coexist, clinicians usually prioritize a careful search for mechanical obstruction, incomplete imaging, or other organic disease before accepting a functional E2 label.

How the CalcMD checklist maps to Rome IV

The calculator mirrors the nine mandatory items encoded in the implementation: seven biliary pain criteria plus the two SOD-specific items. If any biliary pain item is unchecked, the overall Rome IV E2 pattern is not met. If all seven pain items are met but the SOD-specific pair fails, the tool reflects biliary-type pain without fulfillment of functional biliary SOD, which often redirects workup toward structural disease or alternative functional diagnoses such as functional gallbladder disorder (E1) when the gallbladder remains in situ and imaging is unrevealing.

Ancillary findings (not part of the core nine)

Clinicians sometimes integrate additional data:

Normal amylase and lipase helps shift attention away from dominant pancreatic sphincter syndromes and acute pancreatitis in the appropriate clinical picture.
Hepatobiliary scintigraphy may show delayed biliary drainage, which can support impaired flow across the sphincter region when interpreted by experienced readers.
Sphincter of Oddi manometry historically identified high basal sphincter pressures; invasive manometry is now infrequently used for routine diagnosis, and therapeutic decisions based solely on manometry have been re-evaluated in contemporary trials and practice patterns.

These adjuncts inform judgment but do not replace the published Rome IV criterion set that the calculator applies.

Important limitations

This material and tool are for education and criterion organization, not standalone diagnosis or treatment planning.
Imaging modality choice, laboratory timing, and comorbid liver disease can blur enzyme and duct interpretations; results must be integrated by a qualified clinician.
Overlap with other functional gastrointestinal disorders is common; meeting or failing criteria does not remove the need for follow-up if symptoms evolve or alarm features appear.
Therapeutic endoscopy carries procedural risk; shared decision-making should reflect current evidence, patient values, and center expertise.