Veterinarians can choose to pursue a career as a general practitioner, providing a first opinion service and developing a great breadth of knowledge of many different conditions. As they gain experience, they can also progress to become Advanced Practitioners.Alternatively, they may choose to specialise in a particular discipline. This requires a qualified vet to undergo substantial further training and to pass exams to prove that they have the required level of knowledge and experience in their chosen field. Only those that have been through this process can call themselves Specialists and they need to be re-accredited regularly in order to continue using the title. Not all practices offering referral services have the availability of Specialists.