Depending on the veterinarian a person can expect a some differences in the timing of the results as well as the how many "extra" procedures are included in a fairly open, blanket procedure such as a necropsy.
The office's distance from and relation to the testing site that is employed can influence the amount of time it takes to receive results from any ordered tests.
Also, not every veterinarian's office is equipped with the same type of equipment (the relative age of the equipment and, thus, the types of tests and diagnosis that can be done in house, also varies). Some vets may include certain "non-standard" tests as part of necropsy for various reasons. The fact that April's vet seemed to zero in on a liver problem related to the consumption of well water may not be a "blanket diagnosis" or any other type of coincidence, the chances are that this vet knows the types of problems that have been reported, discovered and previously diagnosed in the area and has decided that to save his clients (as well as his office) some time and money he has taken on the task of including some of these tests as part of the routine set of procedures to include in the necropsy.
Call a vet in six different parts of the country and you will receive six different answers about what is all included in the price of some fairly standard procedures - not to mention six widely ranging prices.
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Stay United!

"...I say 'apparently' because despite all our progress she is not at all a tame or handle-able snake and gettting her from that cage would re-start a war.. and we've had a good armistice for several months now."-Gus Rentfro - I love this quote!