Friday, 13 November 2015

True about fat absorbtion | PGI MCQs for MD MS Preparations

True about fat absorbtion 

A. Fat in stool > 6 gm/day indicate malabsorption 
B. C-glycine test is most sensitive test 
C. Major fat absorption occurs in proximal intestine 
D. Steatorrhea means stool fat> 10 gm/day 
E. Steatorrhea is increased fat in stools >20gm/day



Ans. A. Fat in stool > 6 gm/day indicate malabsorption:
(C) Major fat absorption occurs in proximal intestine :
·      Normal fecal fat excretion is less than 6gm/day, more than 6 gm/24 hr indicates malabsorption.

• Fat absorption takes place in small intestine except short chain fatty acids which is absorbed in colon 
• Sudan is best for screening but gold standard is quantitative estimation of fecal fat. OraL glycin glycolate test may show bile acid malabsorption, but not best for screening. 
- Steatorrhea is defined as stool fatexeeeding 7g/day 
- Daily fecal averages 15-25 g with small intestine disease, often exceeds 40 gm with pancreatic disease.