I’m having a hard time getting enough blood out of my finger, what do I do? COR January 19, 2021 16:46 Updated Try the using a different finger. We recommend the middle, ring or pinky finger. When drawing blood from your finger, lightly apply pressure to your finger to assist the blood flow. If you are having difficulty drawing blood, try a second lancet. Related articles How do I know when I have enough blood on my finger? Do you have a video tutorial for how to check-in? I’m nervous about inserting the cartridge correctly into The COR, have any tips? How do I dispose of the lancets and COR Cartridges? Have any tips for lancing my finger? Comments 0 comments Please sign in to leave a comment.