Tokyo Guidelines for Diagnosis of Acute Cholecystitis

Diagnostic Criteria

The Tokyo Guidelines require the simultaneous presence of at least one local inflammatory sign (e.g., right‑upper‑quadrant pain or tenderness), one systemic inflammatory sign (e.g., fever or elevated inflammatory markers), and confirmatory imaging to establish a definite diagnosis of acute cholecystitis; no single clinical or laboratory feature is sufficient on its own. 1
Right‑upper‑quadrant pain or tenderness is accepted as a local sign of inflammation in the diagnostic algorithm. 2
Fever is accepted as a systemic sign of inflammation in the diagnostic algorithm. 2
An elevated white‑blood‑cell count demonstrates a sensitivity of approximately 70 % and a specificity of 65.8 %; neutrophil predominance shows the strongest association with acute cholecystitis. 2
An elevated C‑reactive protein level is accepted as a systemic inflammatory marker in the diagnostic algorithm. 2

When all three components of the Tokyo Guidelines are correctly applied, the criteria achieve a sensitivity of 91.2 % and a specificity of 96.9 %. 2
A validation study that required strict fulfillment of all three components reported a lower overall diagnostic accuracy of 60.3 %. 3

Murphy’s sign alone has a positive likelihood ratio of 2.8 (95 % CI 0.8–8.6), indicating limited independent diagnostic value. 3
Right‑upper‑quadrant tenderness alone has a negative likelihood ratio of 0.4 (95 % CI 0.2–1.1), with the confidence interval crossing 1.0, reflecting limited standalone accuracy. 3
No single clinical sign or laboratory test reaches a positive likelihood ratio > 1.6 or a negative likelihood ratio < 0.4. 2

Combining detailed history, comprehensive physical examination, laboratory testing, and imaging yields a pooled positive likelihood ratio of 25.7 and a negative likelihood ratio of 0.24 when the components are properly integrated. 4

The overall quality of evidence supporting the optimal diagnostic algorithm for acute cholecystitis is rated as very low, reflecting uncertainty about the best combination of clinical, laboratory, and imaging elements. 1

The American College of Physicians recommends starting with abdominal ultrasound as the initial imaging test for suspected acute cholecystitis in non-pregnant adults, due to its high sensitivity and specificity, with a strength of evidence rated as high 5, 6
Clinical signs to identify include Murphy's sign, right upper quadrant pain and tenderness, fever, and vomiting or food intolerance, as recommended by the World Journal of Emergency Surgery, with a strength of evidence rated as moderate 7, 8, 9
Laboratory findings such as elevated white blood cell count and C-reactive protein are also important, as stated by the World Journal of Emergency Surgery, with a strength of evidence rated as moderate 7

Abdominal ultrasound is the recommended initial imaging modality, with a sensitivity of 98.6% using a one-sign criterion and 80.9% sensitivity using a two-sign criterion, as reported by Clinical Infectious Diseases, with a strength of evidence rated as high 5, 6
CT scan with IV contrast is recommended as the next step if clinical suspicion persists after an equivocal ultrasound, with a sensitivity of 92-93.4% for acute cholecystitis, as stated by Clinical Infectious Diseases, with a strength of evidence rated as moderate 6
HIDA scan (hepatobiliary scintigraphy) or MRI/MRCP can be used as third-line imaging, with HIDA scan being the most sensitive imaging modality for cholecystitis overall, as reported by Clinical Infectious Diseases, with a strength of evidence rated as moderate 6

The diagnosis of acute cholangitis requires the triad of clinical signs (jaundice, fever, chills, right upper quadrant pain), laboratory findings (indicators of inflammation and biliary stasis), and imaging findings (biliary dilatation or evidence of etiology), as recommended by Clinical Infectious Diseases, with a strength of evidence rated as high 5, 6
The Tokyo Guidelines Criteria include one local sign (Murphy's sign, mass/pain/tenderness in RUQ), one systemic sign (fever, elevated WBC, elevated CRP), and confirmation by imaging, with a reported overall accuracy of 60.3%, as stated by Praxis Medical Insights, with a strength of evidence rated as low 9