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  Those last numbers aren't really indicative of a shunt....it is usually MUCH higher than that....as in triple digits.  Dr Center states "normal" is a post fast of 25. 
 There are outside influences that can affect the results of this test. Medications or simply what they've eaten. Bile acids do fluxuate from day to day...they aren't constant.
 
 I'm not so sure I wouldn't just re-test in a week or so.  Or perhaps contact Cornell and have them examine him before proceeding further.
 
				__________________ Deb, Reese, Reggie, Frazier, Libby, Sidney, & Bodie |