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Classification of blood collection methods

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Classification of blood collection methods

(1) Intravenous blood sampling

Venous blood sampling is a method of drawing a certain amount of venous blood through a needle.

Superficial veins located on the body surface are mostly used, usually elbow veins, dorsal hand veins, medial malleolus veins or femoral veins. Children can collect blood from the external jugular vein.

Different types of syringes and corresponding needles can be selected according to the blood volume. For some special inspections, in order to avoid platelet activation, plastic syringes and siliconized test tubes or plastic test tubes should be used.

(2) Skin blood sampling method

Skin blood sampling was once called capillary blood sampling. It collects mixed blood of arterioles, venules and capillaries, and contains intercellular substance and intracellular fluid.

Usually, choose the earlobe or finger area. Earlobe blood collection is less painful and easy to operate, but the blood circulation is poor, the temperature is more affected, and the test results are not constant (such as red blood cells, white blood cells, hemoglobin, and hematocrit are higher than finger blood or venous blood), in general Should not be used. Finger blood collection is convenient and the test results are relatively constant. The World Health Organization (WHO) recommends collection of blood from the inner side of the left ring finger. Infants and young children can collect blood from the big toe or the inner and outer edges of the heel. Patients with severe burns can choose to collect blood from intact skin .

(3) Vacuum blood sampling method

Vacuum blood sampling is also called negative pressure blood sampling.

There are two types of vacuum blood collection devices: sleeve type and scalp vein type.

The closed blood collection does not require transfer between containers, reduces hemolysis, can effectively protect the formed components of blood, ensure the integrity of the original properties of the sample to be tested, and make the test result more reliable. At the same time, the sample transfer is convenient, which can effectively avoid medical staff Cross infection with patients.



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