What is a Blood Test?

A blood test is just a means. Nothing does nt mean that there is nt any, and something does nt mean that it is always there. It s just a probability and a possible problem.

[yàn xuè]

A blood test is just a means. Nothing does nt mean that there is nt any, and something does nt mean that it is always there. It s just a probability and a possible problem.

Chinese name

blood test

Foreign name

blood test

The blood tests in the physical examination are generally blood tests and biochemical tests.

Blood tests can test liver function, sexually transmitted diseases, AIDS, pregnancy, normal pregnancy, and drug use.

Blood tests for general physical examination are usually for checking hepatitis ~~~

In the laboratory of the hospital, many patients often take blood tests from their arms.

Why is the blood sampling point set on the ring finger of the left hand

Easy to operate and safer

The hand is the most flexible and flexible organ in the exposed part of the human body. Blood is taken from the hand for doctors to operate. In addition, because the tip of the finger has a very rich capillary network, and there are no large arteries and veins, using the finger to take blood can not only meet the clinical needs, but also avoid a lot of bleeding.

Does not affect daily functions

Although finger blood is a small artificial trauma, it still takes a few days for the small wound to fully heal. In daily life, most people are right-handed, that is, fine and complex movements are mostly performed with the right hand, such as writing with a pen, using chopsticks to dine, sewing, rusty flowers, etc., while the left hand is relatively free time. . In this way, the left hand is used to take blood, and the influence of the hand function is relatively small. The thumb, forefinger and little finger are the main functional fingers of a human hand. Accurate and precise movements depend on their coordination. The middle finger bears more power than the ring finger in all kinds of labor, so the responsibility for testing blood collection should fall on the left ring finger.

Minor trauma

In anatomy and physiology, the flexor tendon of each finger is wrapped by a synovial capsule to play a role of lubrication and shock resistance. The size, depth, and anatomical structure of the synovial capsule of different fingers are different. Among them, the synovial sac of the thumb and little finger can go directly to the deep part of the palm. In this way, if one thumb or little finger is infected, it may cause a deep infection of the entire palm, and it may spread to other fingers. The synovial sac of the index finger, middle finger, and ring finger are relatively independent, and the synovial sac of the ring finger is located in the superficial part of the palm. Therefore, even if there is an infection, it will not cause deep lesions in the palm or affect other fingers.

Pain is light

The nerve endings of the finger are abundantly distributed, and the nerves of different fingers are subject to different innervations, and their pain thresholds are not the same. The palmar surface of the little finger is innervated by the ulnar nerve, the palmar surface of the thumb, index finger, and middle finger are innervated by the median nerve, the ulnar side of the ring finger is innervated by the ulnar nerve, and the radial side is innervated by the median nerve. If blood is taken in the middle of the fingertips of the ring finger, the nerve endings of the ulnar nerve and median nerve will be stimulated at the same time, which will cause stronger pain. Taking blood from the ulnar side of the fingertips of the ring finger only involves the ulnar nerve endings, because the area of influence is less and the pain is mild.

Other situations

When you go to the hospital for a blood test, you can use peripheral blood for any test items such as blood routine, blood type, platelet count, hemoglobin measurement, and Plasmodium test. The above analysis shows that the best blood collection site is the left hand (the left-handed person takes the right hand) the ring finger side of the ring finger. Of course, if the patient is an infant less than half a year old, doctors usually collect blood on the thumb or heel of their feet because their fingers are too small for blood collection. For patients with severe burns, doctors can only choose blood from whole areas of the skin.