What is the size of the biopsy channel suitable for submucosal sampling?

The size of the biopsy channel suitable for submucosal sampling is 3.7 mm. This size is optimal because it allows adequate passage of instruments necessary for submucosal dissection or sampling while minimizing trauma to the surrounding tissue. A 3.7 mm channel provides sufficient space for the endoscopic tools used in such procedures, which often require manipulating more rigid instruments or specialized devices designed for submucosal surgery. This enables the physician to perform procedures more effectively and ensures high-quality tissue samples, which are critical for accurate diagnosis and management of various gastrointestinal conditions.