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The cholesterol/dry weight ratio: a simple substitute for lithogenic index
The American Journal of Gastroenterology
|June 1, 1982
Summary
A new simple index accurately measures bile lithogenicity using only cholesterol concentration and dry weight. This method is more accessible for routine labs than complex assays, aiding in assessing gallstone risk.
Area of Science:
- Hepatology
- Biliary Chemistry
- Clinical Diagnostics
Background:
- Cholesterol solubility in bile is critical for preventing gallstones.
- Existing lithogenic indices are complex, requiring multiple assays and not accounting for bile water content.
Purpose of the Study:
- To assess a simplified index for measuring bile lithogenicity.
- To compare this simple index with a conventional lithogenic index.
Main Methods:
- Biliary cholesterol concentration and bile dry weight were measured.
- The simple index was compared against a standard lithogenic index.
- Bile samples were analyzed regardless of collection method (aspiration vs. duodenal drainage).
Main Results:
- The simple index showed strong correlation with the conventional lithogenic index.
- The simple index's accuracy was unaffected by bile water content variations.
- Correlation remained consistent across different patient groups and bile collection methods.
Conclusions:
- A simple index measuring biliary cholesterol and dry weight reliably assesses bile lithogenicity.
- This accessible method overcomes limitations of complex assays, enabling routine laboratory use.
- Facilitates broader application of lithogenic index studies for gallstone risk assessment.