The following methods help blood circulation and blood collection:

Wash your hands with warm water and soap to warm your fingers before taking blood. Remember to wash and dry your fingers.
Keep your arms straight, causing blood to flow to your fingertips.
Hold the area below the finger joints facing the fingertips, gently massage in the direction of the fingertip, and then press for 3 seconds.
You can also adjust the Accu-Chek lancing device to a higher resolution to achieve a sufficient amount of blood.