Prevalence of nonalcoholic fatty liver disease (NAFLD) and utility of FIBROspect II to detect liver fibrosis in morbidly obese hispano-american patients undergoing gastric bypass

Gustavo Eugenio Guajardo-Salinas, Ashraf Hilmy

Research output: Contribution to journalArticle

17 Scopus citations


Background: Our study describes the prevalence of nonalcoholic steatohepatitis (NASH) and liver fibrosis in Hispano-American morbidly obese patients and the utility of different serum markers to predict significant liver fibrosis in this population. Methods: We perform a retrospective chart review of all patients undergoing Roux-en-Y gastric bypass with routine liver biopsy performed at Valley Baptist medical center during a 24-month period (2005-2006). Results: Of 129 liver biopsies, only 25.7% had some degree of steatosis, but about 55% had NASH, and 30.9% had liver fibrosis. Of those patients with liver fibrosis, only 6.9% had moderate to severe fibrosis (stages 2-4), and only one patient had cirrhosis (0.7%). Of the 129 patients, only 92 had a FIBROspect score II in their chart, and they ranged from 9 to 95, with a mean of 28.3. Of these patients, 36 had a score less than 20, and none had significant fibrosis in their biopsy. FIBROspect II® score (cutoff <20) had a negative predictive value (NPV) of 100% (confidence interval (CI) 95%, 0.9035-1) positive predictive value (PPV) of 15% (CI 95%, 0.0838-0.2693), sensitivity of 100%, and specificity of 42% to predict stage 2 fibrosis or higher. Conclusions: NASH and liver fibrosis are present in a high percentage of morbidly obese patients. Liver function tests and ultrasound are not reliable tests to diagnose or rule out advance liver fibrosis. The use of FIBROspect II® score in the preoperative evaluation of morbidly obese patients can rule out significant liver fibrosis (stages 2-4) and avoid the morbidities related to liver biopsy.

Original languageEnglish (US)
Pages (from-to)1647-1653
Number of pages7
JournalObesity Surgery
Issue number12
Publication statusPublished - Dec 1 2010



  • Gastric bypass
  • Liver fibrosis
  • Morbid obesity
  • NASH

ASJC Scopus subject areas

  • Surgery
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

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