system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Lead time is defined is-
assistant
The correct answer is  Ans. is 'b' i.e., Time between point where the diagnosis is made by screening test to usual diagnosis * The lead time is the time period between diagnosis by early detection (i.e., earliest point of diagnosis by screening test) and diagnosis by standard diagnostic tests. Lead time is the advantage gained by screening.