Peripheral blood tests are usually used to check routine blood tests, rapid blood glucose, blood type, etc. According to the "Consensus on Peripheral Blood Collection in China", the peripheral blood collection population is children under 6 years old, special**, and venous blood testing should be given priority for patients over 6 years old.
Special ** includes:
Severe burns;
Extremely obese;
Those with thrombophilia tendency;
Those who need to retain a superficial vein for intravenous administration**;
Superficial veins are not readily available;
Self-sampling of blood tests (e.g., diabetes) and point-of-care testing are required.
If there is dehydration or edema, resulting in poor peripheral circulation, it is not recommended to collect peripheral blood, which will affect the accuracy of the results. Compared with venous blood, peripheral blood has many influencing factors, and if the collection process is not standardized, it is easy to lead to error or inaccuracy of detection results. Due to the small amount of blood collected or the difficulty of bleeding during peripheral blood collection, it is easy to mix tissue fluid into the blood when a certain pressure is applied, resulting in abnormal (increased or decreased) results in routine blood measurement. Hypotropia of platelets occurs due to small volume of peripheral blood collection, sometimes inadequate specimen anticoagulation, or excessive squeezing of the fingers and slow blood flow to produce clots.
When the peripheral blood test is tested, the reproducibility is poor, and when the result is abnormal and needs to be retested, it is generally necessary to retake the blood. If venous blood is easy to collect, venous blood laboratory examination is generally preferred, and the examination results are the most accurate and stable, which is conducive to accurate judgment of the condition.