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The Toxicology Laboratory provides analytical services focusing on the identification and quantification of drugs, metals, and other potential toxicants as well as nutritional analysis for vitamins and minerals. Our testing and expertise supports veterinarians, feed producers, biomedical researchers, law enforcement authorities, and others in their work to ensure animal welfare.

Order Toxicology Tests


The Toxicology section offers a comprehensive test catalog useful both inside and outside the clinic. We are committed to working directly with our clients to address individual needs and concerns and offer turnaround times that reflect the urgency in each request entrusted to us.

Our major services include:

  • Equine drug screening and Vitamin E/Selenium monitoring to ensure peak athletic performance
  • American Board of Veterinary Toxicology-certified toxicologist providing case consultations and interpretation of results
  • Customized method development, assistance with test and specimen selection, and interpretation of results for biomedical and academic researchers
  • Identification of common household medications and products, anticoagulant rodenticides, lead, and other poisons frequently encountered by dogs and cats
  • Livestock and companion animal feed and tissue trace mineral analysis

Our online test catalog is not exhaustive. Please contact us with any specific questions, project proposals, or suggestions.


Karyn Bischoff, DVM, MS, DABVT
Director, Toxicology

Jennifer Moiseff
Laboratory Manager


  • Red Maple Syndrome in Horses: This year we took on an undergraduate student researcher who is investigating the cause of Red Maple Poisoning in Horses with us, hoping to identify the causative toxic compounds.
  • Wheat/DON Study: A Collaborative Wheat/Deoxynivalenol (DON) study with Dr. Gary Bergstrom of Plant Pathology at Cornell. This study is a continuation of work done in 2009 where we quantified the mycotoxin DON in various portions/fractions of the wheat from a field previously inoculated with Fusarium graminearum. This fungus is the causal agent of head blight of wheat and also produces two major mycotoxins, Zearalenone and Deoxynivalenol (DON), both having potential health consequences to livestock and people. Our findings and detection of DON in the straw portions have not been documented previously, to our knowledge. Currently, we are comparing inoculated wheat to wheat not inoculated with Fusarium graminearum and analyzed for the presence of DON in the fractions as above. Another on-going study is on the effect of ensiling on DON concentrations in corn. 
  • CUAES Hatch Project, Assessing the fate of drugs in livestock mortality and manures, J. Bonhotal, K. Bischoff. $90,000/year, Project Period 09/01/2009-09/01/2012.  This study will determine the environmental fate of veterinary drugs in composed animals and manure.
  • Cornell 4-Poster Deer Permethrin Project on Shelter Island: This project is collaborative study with Cornell wildlife biologists and the Department of Environmental Conservation (DEC) involving the assessment of Permethrin residue concentrations in edible tissues of deer harvested on Shelter Island. This has been an ongoing study since 2006.    
  • Deer Selenium Study: Assessment of Selenium concentrations in livers from wild deer in the Ithaca N.Y. area in conjunction with the Earn-A-Buck Hunter Program at Cornell University and deer from Shelter Island in NYC area.
  • Sulfur in Bovine Study: RAC Seed Grant, Evaluation of Sulfur Concentrations in Bovine Urine, Kidney, and Liver, C.G. Lamm, S.E. Morgan, J.D. Taylor, K. Bischoff. $3,413, Project Period 01/01/2010-12/31/2010.  This study will determine if tissue and urine sulfur concentrations are different in cattle with sulfur-induced polioencephalomalacia.
  • Memorandum of Understanding with National Research and Quarantine Service, Anyang, Republic of Korea: For joint projects including mycotoxin detection, biomarkers for lead and other heavy metals, and phytotoxin detectionK. Bischoff, H.G. Kang. $60,000/year, Project Period: 7/01/08-6/30/11.  Funding for this project has been used to determine the use of aminolevulinic acid  (ALA) for lead in cattle, the DON and red maple studies above, and will be used to develop a method for detection of Amanita spp mushroom toxins in the future.


  • K. Bischoff, W.K. Rumbeiha (2018). Pet Food Recalls and Pet Food Contaminants in Small Animals: An Update. Vet Clin North Am Small Anim Pract. 48(6): 917-931. doi: 10.1016/j.cvsm.2018.07.005.

  • K. Bischoff, J. Moiseff (2018). Equine feed contamination and toxicology. Translational Animal Science 2(1): 111-118.

  • K. Bischoff, G. Finstad, M. Cary, J. Hillebrandt, J. Moiseff, H.N. Erb (2017). Variations in blood selenium and serum vitamin E in reindeer (Rangifer tarandus tarandus) described by location, husbandry, and season. Rangifer 37(1): 1-10.

  • K. Bischoff, A. Chiapella, J. Weisman, L.M. Crofton, J. Hillebrandt (2017). Zinc toxicosis in a dog secondary to ingestion of a holiday garland. J Med Toxicol. 13(3): 263-266.

  • J. Hopkins*, M. Pardo*, K. Bischoff (2017). Serotonin syndrome from 5-hydroxytryptophan supplement ingestion and presumptive hydrogen peroxide toxicosis in a 9 month old Labrador retriever. J. Med Toxicol. 13(2): 183-186.

  • K.M. Walter*, K. Bischoff, R. de Matos (2017). Severe lead toxicosis in a Lionhead rabbit. J Med Toxicol 13(1): 91-94.

  • K. Bischoff, J. Hillebrandt, H.N. Erb, B. Thompson, S. Johns (2016). Comparison of blood and tissue lead concentrations from cattle with known lead exposure. Food Addit Contamin Part A Chem Anal Control Expo Risk Assess. 13: 1-7.

  • J.W. Spoo, D.L. Zoran, R.L. Downey, K. Bischoff, J.J. Wakschlag (2015). Serum biochemical, blood gas and antioxidant status in search and rescue dogs before and after simulated fieldwork. Vet J. 206(1):47-53.

  • K. Bischoff, M. Smith, S. Stump (2014). Treatment of Pieris Ingestion in Goats with Intravenous Lipid Emulsion. J Med Toxicol. 10(4):411-414.

  • K. Bischoff, W. Higgins, B Thompson, J.G. Ebel (2014). Lead excretion in milk of accidentally exposed dairy cattle. Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 31(5):839-44.

  • K. Agrawal*, J.G. Ebel, K. Bischoff (2014). A rapid screen for four corticosteroids in equine synovial fluid. J Anal Toxicol. 38(5):272-279.

  • C. Karanfil, K. Bischoff, G. Bunker (2013). Hg and Se Speciation in Liver Tissue of Marine Birds. 2013 J. Phys.: Conf. Ser. 430 012039.

  • K. Agrawal*, J.G. Ebel, C. Altier, K. Bischoff (2013). Identification of protoxins and a microbial basis for red maple (Acer rubrum) toxicosis in equines. JVDI. 25: 112-119.

  • K. Bischoff, W. Rumbeiha. Pet food recalls (2012). Vet Clin Small Anim. 42: 237–250.

  • K. Bischoff, B. Thompson, H.N. Erb, W.P. Higgins, J.G. Ebel, J. Hillebrandt. Declines in blood lead concentrations in clinically affected and unaffected cattle accidentally exposed to lead (2012). JVDI. 24: 182-187.

  • K. Bischoff, R. Jaeger, J.G. Ebel. An unusual case of relay pentobarbital toxicosis in a dog (2011). Journal of Medical Toxicology. 7: 236-329.

  • K. Bischoff, M.C. Smith. Toxic Plants of the Northeastern United States (2011). Vet Clin Ruminants. 27: 459-480.

  • H.G. Kang, K. Bischoff, J.G. Ebel, S.H. Cha, J. McCardle. Comparison of blood lead and blood and plasma δ-aminolevulinic acid concentrations as biomarkers for lead poisoning in cattle (2010). JVDI 22: 903-907.

  • T. McComb ,* K. Bischoff, B. Thompson, M.C. Smith, H.O. Mohammed, J.G. Ebel, J.R. Hillebrandt. An investigation of blood selenium concentrations of goats in New York State (2010). JVDI 22: 696-701.

  • K. Bischoff, C. Gaskill, H.N. Erb, J.G. Ebel, J.R. Hillebrandt. Comparison of 2 methods for blood lead analysis in cattle: graphite-furnace atomic absorption spectrometry and LeadCare® II system (2010). JVDI 22: 729-733.

  • C. Lamm,* K. Bischoff, H.N. Erb, C.L. Guard, J.R. Hillebrandt, B. Thompson, B.L. Njaa. Trace-mineral concentrations in dairy cattle with rupture of abdominal-artery aneurysm (2010). Bovine Pract. 44: 36-41.

  • K. Bischoff, H. Priest,* A. Mount-Long. Animals as sentinels in lead poisoning: a case report (2010). J Med Toxicol 6: 185-189.

*indicates student or resident