Is it better to draw venous blood or lance finger blood for routine blood work?

The blood taken from the earlobe or the fingertip is the peripheral blood of the body. The peripheral blood circulation is poor and is greatly affected by temperature. Especially in winter, you should warm up your body, especially your earlobes and hands, before taking blood for examination, otherwise the results will not be stable enough. Peripheral blood collection often requires a certain amount of pressure due to the small amount of blood collected or the difficulty of bleeding, which can easily cause tissue fluid to be mixed into the blood, resulting in abnormal (elevated or lowered) results in some of the routine blood measurements. In addition, it fluctuates greatly, it is not easy to review the small amount of blood collected, and the inherent error of manual operation and the difference between the examiners are also problems that cannot be ignored. Earlobe blood sampling is less painful, but the volume of blood collected is less, making it more difficult to collect blood, especially for those with smaller earlobes. Fingertip blood collection will be more than earlobe blood, but the pain is more obvious, because the human fingertip distribution is very rich in sensory nerve endings. The skin should be cleaned before blood collection from the endings, and after blood collection, the needle puncture should be pressed tightly with a sterilized cotton block or other hemostatic items, without touching the stolen goods, and without immersing in water immediately to wash hands, or else it will easily cause infection. It is best to avoid extracting finger blood for fingertip wounds, nail groin infections, redness and swelling, or skin diseases. Many laboratory tests need to take venous blood. Routine blood tests can of course use venous blood, and its application is related to the introduction of large-scale automatic blood cell analyzers in laboratories. Venous blood used as routine blood tests have been implemented for many years abroad, with less pain during blood collection and puncture (relative to finger blood collection), anticoagulant added norms and other advantages. Especially after the use of vacuum blood collection system, although the volume of blood collection is slightly larger, but it is easy to mix the specimen uniformly on the instrument, and the technology used in processing and analyzing the specimen is more and more advanced, with fewer and fewer factors of human influence, which makes the results of the measurement more stable, and is more valuable for diagnosis and treatment. At present, the conditions of hospitals and laboratories in China are different, and some hospitals still lack better equipment and still use peripheral blood, which is feasible. If the hospital you visit has good medical equipment and conditions and uses venous blood for routine blood tests, it is recommended that you accept this method. Routine blood test results are generally in the diet and drinking water has no obvious relationship, if the doctor has no special instructions, you can test at any time.