When you undergo surgery blood work is always required.
Absolutely necessary, so many things can be detected through blood work.....irregularities in white or red counts, bile levels out of wack or any infections. Another thing I have done before surgery is a coagulation test....just to make sure that there is no possibility of excessive bleeding.
Your vet should be able to do it at the time you take him in for nuetering.
__________________ Mardelin Yorkshire Terriers |