"Depending on their location, veterinarians will be requested to send samples either directly to the OncoPet testing facility or to regional collection centers. "
The website does not list any regional collection centers. If the vet is local, the sample is collected, processed and shipped via a delivery service or if the vet is not local, it is collected, processed to serum and shipped with dry ice.
Again, what happened to the drop of blood on a piece of filter paper as described in the S1?
This is not an easy collection method and all the vets I have used send whole blood samples out for normal testing locally. I do not know any local vets who have centrifuge capability.