<qa>  What is the rate of follow-up diagnostic colonoscopy after abnormal FIT?Rationale and plan for Part 2: With the current program, the rate of follow-up diagnostic colonoscopy after abnormal FIT is 58. Since individuals with abnormal FIT have an increased chance of having colorectal cancer, identifying alternate strategies to improve compliance with diagnostic colonoscopy is desirable. Accordingly the sub-study will employ a simple alerting tactic through the color of the envelope red for abnormal and white for normal. The investigators hypothesize that more patients will follow-up after receiving a positive FIT result as a result of the messaging importance of abnormal tests with a red envelope. Because the sub-study will be employed in 2 predetermined rounds of invitations, investigators will have the opportunity to conduct a pre-post analysis of the follow-up rates to test this hypothesis. 