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Equine Immunology Testing

Clinical History
Physical Examination
Complete Blood Cell Count
Fibrinogen and Globulin Levels
Culture of Organisms

Serum Immunoglobulin Concentrations
IgG, IgM, IgA
Radial Immunodiffusion

Peripheral Blood Lymphocyte Phenotyping
B Cells, CD4 + T cells, CD8 + T cells
Flow Cytometry

Tetanus Toxoid Vaccine Response
Pre - and 15 to 20-day post-vaccination serum samples

Immunologic testing should be performed when there is a clinical history of recurrent infections and fevers, either refractory to treatment, or caused by opportunistic organisms. The history of infections supports abnormal immunologic testing findings. It is important to rule out other causes that may predispose to infections, including conditions that disrupt pathogen clearance mechanisms (e.g. stress, immunosuppressive therapy, viral infections, catheterizations, allergies, auto-immunity, lymphoma/lymphosarcoma).

Rechecking abnormal values in 30-45 days is advised to account for dynamic changes during disease in an immunocompetent system. Immunologic testing in foals is better interpreted when accompanied by control samples from age-matched and breed-matched healthy foals to account for developmental changes in the immune system.


Immunological testing in horses:

Testing Submission Form