Presurgical Bloodwork tells us how healthy your pet actually is and gives us a better understanding of how his/her organs and body are functioning. It tells us if there are likely to be surgical complications or difficulty handling the anesthesia. If you choose to decline Presurgical Bloodwork, there is no way for us to know if your pet has an underlying condition that will negatively affect the outcome of the surgery. All animals over seven years of age are required to have Presurgical Bloodwork before undergoing anesthesia to ensure their safety.