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CholeS Score for Laparoscopic Cholecystectomy Duration

Predicts operative time >90 minutes for elective or emergency laparoscopic cholecystectomy

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Why use it

Prolonged laparoscopic cholecystectomy (>90 min) is associated with higher complication rates, greater blood loss, increased conversion to open surgery, and greater resource utilization. The CholeS score allows surgical teams to anticipate complexity preoperatively, allocate theatre time appropriately, and counsel patients about operative risk before consent.

About

The CholeS score is a validated preoperative scoring system developed by the UK CholeS Study Group to predict the duration of laparoscopic cholecystectomy. Derived from a prospective multicenter cohort of over 8,000 patients across 166 UK hospitals, it quantifies patient- and disease-related factors known to increase operative complexity. The score enables theatre scheduling optimization, stratification of trainee-appropriate cases, and identification of patients who may benefit from conversion planning or senior surgeon involvement. It predicts the probability of operative time exceeding 45 or 90 minutes using validated cutpoints.

When to use

  • Preoperative planning for all patients listed for laparoscopic cholecystectomy (elective or emergency)
  • Theatre scheduling and allocation of senior vs. trainee surgeons
  • Preoperative patient counseling regarding operative time and conversion risk
  • Research stratification for surgical outcome studies
  • Identifying patients who may require prolonged admission or HDU access postoperatively

Formula

CholeS Score = Sum of weighted points: Male sex ............ +1 Age 50–69 years ..... +1 Age ≥70 years ....... +2 BMI 30–39.9 kg/m² .. +1 BMI ≥40 kg/m² ...... +2 Previous upper abdominal surgery .. +2 Acute presentation .. +2 CBD stones on imaging ............ +2 Hepatic cirrhosis ... +3 ASA grade ≥3 ........ +1 Total range: 0–16 Low risk: 0–3 (predicted time <45 min) Medium risk: 4–6 (predicted time 45–90 min) High risk: ≥7 (predicted time >90 min)

Pearls & pitfalls

  • Cirrhosis is the single highest-weighted factor (+3 points) — portal hypertension dramatically increases bleeding risk and operative complexity.
  • Acute presentation (cholecystitis, biliary pancreatitis) doubles the expected operative time compared to elective biliary colic.
  • Male sex independently predicts longer operative time — possibly due to greater adipose distribution around the hepatoduodenal ligament.
  • CBD stones significantly increase complexity — these cases often require intraoperative cholangiography or combined ERCP planning.
  • BMI ≥40 adds an additional point: visceral obesity specifically (not subcutaneous) limits laparoscopic working space.
  • Score ≥7 predicts >90-minute procedures with sensitivity ~70% and specificity ~75% in validation cohorts.
  • This score does not predict conversion to open surgery directly, but high-scoring cases have substantially higher conversion rates.
  • Previous upper abdominal surgery (including open cholecystectomy, gastrectomy, hepatic resection) causes adhesions that substantially increase complexity.

Next steps

Score 0–3 (Low): Suitable for trainee-led procedures; standard theatre allocation; routine consent. Score 4–6 (Medium): Consultant oversight recommended; extended theatre slot advised; inform patient of complexity. Score ≥7 (High): Senior/consultant surgeon preferred; conversion planning; HDU access; extended theatre time; ensure senior anesthetic cover.

Evidence

Bharamgoudar R et al. (Surg Endosc 2016) derived and validated CholeS in 8,820 patients across 166 UK hospitals. The score significantly outperforms BMI or age alone in predicting >90-minute operative time. AUC 0.73 for duration >90 minutes. Internal validation confirmed calibration. Endorsed by the Association of Laparoscopic Surgeons of Great Britain and Ireland (ALSGBI).

References

  1. Bharamgoudar R et al. The development and validation of a scoring tool to predict the operative duration of elective laparoscopic cholecystectomy. Surg Endosc. 2016;32(7):3149-3157. — link
  2. Gianni P et al. Prediction of operative difficulty in laparoscopic cholecystectomy. Surg Laparosc Endosc Percutan Tech. 2018;28(4):221-224. — link