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					Originally Posted by Ellie May  Bile acid testing is the best way to screen.Any vet who can draw blood should be able to do a Protein C test.
 If the numbers are in one range it is indicative of MVD and if the numbers are in another it is indicative of shunt.  The range that the numbers fall in to suggest MVD are also the "normal" range I believe.  So dogs with large shunts have abnormal Protein C numbers.  If the number came back in normal range you wouldn't know if the dog has MVD or is normal.  That is why the BAT is used...
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  So what you are saying is the Protein C will just rule out an external shunt but will not rule out MVD?