The practical exam is held on the final day of the course. Candidates are examined in pairs by a two-member panel of DNS instructors. Each candidate draws two questions: one related to DNS diagnostic tests and one focused on DNS therapy. They must demonstrate and verbally explain their assigned topics using their partner as the model. The examiners may ask additional follow-up questions related to the topic. If the candidate does not pass the exam, they do not receive the DNS Therapist Certificate but may reapply the following year after retaking Course D.