Send us a copy of the patient’s previous results- these will need to be on the lab or dermatologist’s letterhead; printed patient records or in-house results will be returned. Fill out our order & history forms as detailed as possible. Indicate on the order form that it is a competitor retest. Attach previous results to order/history forms and package with the serum sample. Send it off using one of our pre-paid FedEx labels. Please note clinics are limited to 5 retests! The original testing panel must be a serum-based assay unless it is an intradermal test conducted by a licensed veterinary dermatologist. Sensitivity (hair, and saliva-based assays) do not qualify under our competitor retest program protocol.