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It doesn't produce the same outcome because your skin has sensors and blood vessels underneath to trigger more cell production to heal the wound. Hair is different. It doesn't have any blood vessels on it so it can't bleed. Nails wont bleed but if you cut them too short and rip or puncture the skin it can happen. Hopefully this helps

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Q: Why does cutting your skin hurt and might possibly bleed but cutting your hair or nails does not produce the same outcome?
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Histocompatibility antigen test?

DefinitionA histocompatibility antigen blood test looks at proteins called human leukocyte antigens (HLAs), which are found on the surface of nearly every cell in the human body. HLAs are found in large amounts on the surface of white blood cells. They help the immune system tell the difference between body tissue and foreign substances.Alternative NamesHLA typing; Tissue typingHow the test is performedBlood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.How to prepare for the testNo preparation is necessary.How the test will feelWhen the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.Why the test is performedThe results from this test can be used to identify good matches for tissue grafts and organ transplants, such as a kidney transplant or bone marrow transplant.Each person has a small, relatively unique set of HLAs that they inherit from their parents. Children, on average, will have half of their HLAs match half of their mother's and half of their HLAs match half of their father's.It is unlikely that two unrelated people will have the same HLA makeup.There are three main groups of HLA:HLA-AHLA-BHLA-DRHowever, each group contains many different HLA proteins.Some HLA types are more common in certain autoimmune diseases. For example, HLA-B27 antigen is found in many people (but not all) with ankylosing spondylitis and Reiter syndrome.This test may also be used to determine relationships between children and parents when such relationships are in question. However, newer, more specific genetic testing is now available for this purpose.Normal ValuesEach person has unique HLA antigens, although identical twins may match each other.What the risks areVeins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight but may include:Excessive bleedingFainting or feeling light-headedHematoma (blood accumulating under the skin)Infection (a slight risk any time the skin is broken)


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