 ROLE OF SUCTION IN EUS-FNA It was believed that applying suction to the needle while it is within the desired lesion, improves the quality of aspirate. However, recently there has been a trend to use less or no suction as that provides a less bloody specimen. The only randomized trial comparing suction to non suction techniques observed a higher sensitivity and negative predictive values for malignancy in the suction group compared with the non-suction group. In addition, bloodiness or contamination was not increased in the suction group. 