Lameness is graded on a scale. This allows the practitioner to help quantify a lameness in order to determine relative severity, assess the degree of change after flexion tests or nerve blocks, and to determine the improvement of lameness over time once treatment has been implemented. The most commonly used scale in the United States is a 1–-5 scale of the American Association of Equine Practitioners (AAEP). Other scales are more commonly used outside of the United States, including a 1–10 scale in the United Kingdom.
