This document summarizes information about different screening and diagnostic tests for colorectal cancer. It notes that colonoscopy is currently the best method, but that it requires high adenoma detection rates, especially for right-sided cancers, and must also detect serrated lesions which can be precursors to cancer. CT colonography's accuracy varies by location and radiologist skill in detecting polyps and serrated lesions. Capsule endoscopy has potential but currently misses some cancers. Improving techniques aim to enhance detection rates for all methods and better identify serrated lesions, which require careful follow up colonoscopy.