My vet always does it, and I'm happy to pay for that peace of mind. Megan, my old girl, had PDA, or blue baby syndrome, and my vet did blood work for teeth cleanings, or any other procedure that used twilight sedation, to full anesthesia. Good luck with your search.
Cheers Quad & Gina
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Assume Nothing, Question Everything, Start Thinking!
RIP Megan 3/1998-5/28/2013