It is very painful to select the blood point in the middle of your finger. It is generally recommended that the blood point be taken on the side of the finger, where the nerve distribution is less than that in the middle of the finger, and the pain is less. But don't get too close to the edge of the nail. It's not easy to disinfect and squeeze blood. Blood points can be selected from ten fingers in turn, and most candidates take the other eight fingers except the thumb. Before taking blood, wash hands with warm water and hang your arms to make the blood vessels of your fingers full and easy to take blood. After the blood collection pen pierces the finger, squeeze the blood gently from the heel to the fingertip (blood collection point), and do not squeeze the blood vigorously, otherwise the extruded plasma and tissue fluid account for a large proportion, which will affect the accuracy. What if there is no bleeding or less blood? It may be related to the following reasons:
① poor peripheral (finger) circulation, warm water can be used to wash hands, arm hanging, etc.
② The depth of blood collection is not enough. The blood collection pen has different scales. You should know which scale is suitable for your blood collection and then "start".
③ I didn't master the skill of squeezing blood. In addition to the above "light force", the force of blood squeezing should be at least 0.5cm above the blood taking point, and the skin congestion at the bleeding point can be seen during blood squeezing. If you squeeze blood from a place too close to the bleeding point, and the blood vessels are "flattened", how can you squeeze blood?