It includes colonoscopy, which examines the entire colon; flexible sigmoidoscopy, which examines part of the colon; barium enemas; and virtual colonoscopy.

• 它包括了可以检查整个结肠的结肠镜，可以检查部分肠道的软性乙状结肠镜，钡灌肠，虚拟肠镜。