Abstract: Disclosed herein are systems and methods for improving medical diagnoses and treatments, whether preventive or for a current condition, by healthcare professionals. The disclosed principles may be implemented in a computer-based system across a computer network to assist healthcare professionals in evaluating and treating patients. The disclosed principles provide a universal patient questionnaire that is dynamic with regard to the responses provided during patient interviews. In addition to standardized questions for all patients, the dynamic questionnaire adjusts its inquiries to each patient based on each patient's responses. The dynamic questionnaire gathers at least the minimum information needed to provide an accurate diagnosis for each patient. This ensure physicians that “best practices” for each set of medical facts is followed. It also creates accuracy and uniformity in physician diagnoses and treatment, especially for preventative care situations.