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sensitivity and specificity of a dual antibody test.  ''Company Bulletin Freedom Health LLC'' 1-2.  In: Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>The test has a positive predictive value of 77% and a negative predictive value of 72% and thus cannot be relied upon alone to diagnose EGUS.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  False positive results may arise from rectal trauma (e.g. recent biopsy or rectal examination) or protein losing enteropathy.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  Other tests that require further analysis for sensitivity and specificity<ref name="Sanchez">Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> include:
 
sensitivity and specificity of a dual antibody test.  ''Company Bulletin Freedom Health LLC'' 1-2.  In: Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>The test has a positive predictive value of 77% and a negative predictive value of 72% and thus cannot be relied upon alone to diagnose EGUS.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  False positive results may arise from rectal trauma (e.g. recent biopsy or rectal examination) or protein losing enteropathy.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  Other tests that require further analysis for sensitivity and specificity<ref name="Sanchez">Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> include:
 
*Urine<ref>O'Connor, M.S, Steiner, J.M, Roussel, A.J, ''et al.'' (2004) Evaluation of urine sucrose concentration for detection of gastric ucleration in horses.  ''Am J Vet Res'', 65:31-39.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> and blood<ref>Hewetson, M, Cohen, N.D, Love, S, ''et al.'' (2006) Sucrose concentration in bood: a new method for assessment of gastric permeability in horses with gastric ulceration.  ''J Vet Intern Med'', 20:388-394.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> sucrose absorption as an assay of gastric mucosal permeability
 
*Urine<ref>O'Connor, M.S, Steiner, J.M, Roussel, A.J, ''et al.'' (2004) Evaluation of urine sucrose concentration for detection of gastric ucleration in horses.  ''Am J Vet Res'', 65:31-39.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> and blood<ref>Hewetson, M, Cohen, N.D, Love, S, ''et al.'' (2006) Sucrose concentration in bood: a new method for assessment of gastric permeability in horses with gastric ulceration.  ''J Vet Intern Med'', 20:388-394.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> sucrose absorption as an assay of gastric mucosal permeability
*Serum alpha1-antitrypsin may be released from damaged gastric tissue(Nadeau 2009) and has been detected more frequently in foals with gastric ulceration<ref>Taharaguchi, S, Nagano, A, Okai, K, ''et al.'' (2007) Detection of an isoform of alpha(1)-antitrypsin in serum samples from foals with gastric ulcers.  ''Vet Rec'', 161:338-342.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref>
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*Serum alpha1-antitrypsin may be released from damaged gastric tissue<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref> and has been detected more frequently in foals with gastric ulceration<ref>Taharaguchi, S, Nagano, A, Okai, K, ''et al.'' (2007) Detection of an isoform of alpha(1)-antitrypsin in serum samples from foals with gastric ulcers.  ''Vet Rec'', 161:338-342.  In: Sanchez, L.C (2010) 'Diseases Of The Stomach' in  Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref>
    
===Pathology===
 
===Pathology===
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