Stacie, if it were me, I'd call the clinic back and have the vet call when he's available. Most vets will answer follow-up questions over the phone if you're a continuing client.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."