Analytical validation of fecal 3-bromotyrosine concentrations in healthy dogs and dogs with chronic enteropathy. Academic Article uri icon


  • Studies that have used serum 3-bromotyrosine (3-BrY) to investigate eosinophil activation in dogs have found elevated 3-BrY levels in clinical patients with chronic enteropathy (CE). To our knowledge, a method to measure 3-BrY concentrations in feces has not been reported. We developed and analytically validated an electron ionization gas chromatography-mass spectrometry method to measure fecal 3-BrY concentrations in dogs. The mean and maximum fecal 3-BrY concentrations in healthy dogs ( n = 40) and dogs with CE ( n = 40) over 3 consecutive days were compared. Analytical validation had a limit of blank and a limit of detection of 2.5 and 3.7mmol/g of feces, respectively. The mean coefficients of variation for precision and reproducibility for 3-BrY were 11.2% (range: 7.5-14.2%) and 10.1% (4.8-15.2%), respectively. The ranges of observed-to-expected ratios for linearity and accuracy were 81.3-125% and 85.4-120%, respectively. The reference intervals for mean and maximum fecal 3-BrY concentrations in 40 healthy dogs were 3.7-23.0 and 3.7-37.8mmol/g of feces. Mean and maximum fecal 3-BrY concentrations in dogs with CE were significantly higher than those of healthy dogs ( p < 0.001). Further research is warranted to determine the clinical usefulness of fecal 3-BrY concentrations in dogs with CE.

published proceedings

  • J Vet Diagn Invest

altmetric score

  • 0.25

author list (cited authors)

  • Sattasathuchana, P., Thengchaisri, N., Suchodolski, J. S., Lidbury, J. A., & Steiner, J. M.

citation count

  • 3

complete list of authors

  • Sattasathuchana, Panpicha||Thengchaisri, Naris||Suchodolski, Jan S||Lidbury, Jonathan A||Steiner, Jörg M

publication date

  • May 2019