Ali et al reported the BATS score for predicting choledocholithiasis in a patient with gallstones. The authors are from Sindh Institute of Urology and Transplantation in Karachi, Pakistan.
BATS is an acronym for bilirubin, alkaline phosphatase, transabdominal, and possible sonography.
Patient selection: presence of gallstones
Parameters:
(1) serum total bilirubin in mg/dL
(2) serum alkaline phosphatase in IU/L
(3) common bile duct on transabdominal ultrasonography
Parameter
Finding
Points
serum total bilirubin
<= 2 mg/dL
0
> 2 mg/dL
2
serum alkaline phosphatase
<= 200 IU/L
0
> 200 IU/L
2
common bile duct on US
not dilated
0
dilated (> 6 mm)
3
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 7
• A score >= 5 has a sensitivity of 0.93 and specificity of 0.77 for choledocholithiasis. This score can only be achieved if there is common bile duct dilation plus one or both other parameters.
Performance:
• The area under the ROC curve is 0.98.
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