Minimum requirements for the Au.D. degree include a minimum of 75 semester hours of post-baccalaureate study, meeting prescribed competencies, passing a national exam offered by Praxis Series of the Educational Testing Service, and practicum experience that is equivalent to a minimum of 12 months of full-time, supervised experience. Most states have continuing education renewal requirements that must be met to stay licensed. Audiologists can also earn a certificate from the American Speech-Language-Hearing Association or seek board certification through the American Board of Audiology (ABA). Currently, there are over 70 Au.D. programs in the United States.