Quote Originally Posted by bcr229 View Post
IIRC getting a blood sample from a snake requires the needle to go into the heart. If your BP is sneezing up blood it may have a lung punctured.

Personally I wouldn't have wasted time posting on an online forum, the snake would be headed back to the vet.
It can also be withdrawn from the tail. At least with larger species.

Best of luck to you, that has to be a terrible feeling. I don't think anybody is going to be of much help from here.