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Days Tested: 
Turnaround Time: 
2-3 bus. days
Specimen Requirements: 

2 ml milk

Shipping Container: 

sterile tube

frozen gel packs

See Submission Guidelines for detailed sample collection, handling and shipping information. Freeze samples immediately after collecting. Samples must remain cold, preferably frozen during shipping.

Fees for susceptibility are 19.00 for 1-3 samples, 35.00 for 4-15 samples, and 63.00 for 16-75 samples. For more than 75 samples, please contact us for fee information.

Caution should be used when interpreting these test results, as there is little correlation between in vitro test results and treatment outcomes in the cow. It is advisable to discuss how you will use these results with your veterinarian before requesting this test.  


This test is performed on bacteria isolated from milk culture to determine whether the bacteria is susceptible (in vitro) to commonly used antibiotics. The antibiotics tested include: Ampicillin, Ceftiofur, Cephalothin, Oxacillin, Erythromycin, Novobiocin, Penicillin G, Pen-Novo, Pirlimycin, Streptomycin, and Tetracycline.