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what the risks are blood test, enzyme-linked immunoassay, eia, a rapid test where an antibody, antigen is linked to an enzyme, a means of detecting a match between the antibody, antigen, versatile test is widely used, in the medical laboratory, allows health care provider to, test blood, an antigen, virus, bacteria, immune system recognizes it, something it has, test blood, an antibody, a particular substance, a hormone, an antigen, present in system, blood is drawn, a vein, the elbow, the hand, puncture site is cleaned, antiseptic, an elastic band, around the upper arm to cause the vein to swell, blood, a needle is inserted, vein, blood is collected in air-tight vials, a syringe, band is removed, restore circulation, once the blood has been collected, needle is removed, puncture site is covered to stop any bleeding, sample is then taken, laboratory where it is tested, the target antibody, antigen, target substance is present, in the sample, test solution has an intense color reaction generated by the attached enzyme indicating a positive test result, , child, have this test performed, to explain how the test, practice, demonstrate on a doll, familiar child, what, happen, why, less anxiety, infants, children, test depends on child's age, previous experience, level of trust, prepare child, infant test, procedure preparation, birth to 1 year, toddler test, procedure preparation, 1 to 3 years, preschooler test, procedure preparation, 3 to 6 years, schoolage test, procedure preparation, 6 to 12 years, adolescent test, procedure preparation, 12 to 18 years, the needle is inserted to draw blood, feel moderate pain, others feel only a prick, stinging sensation, some throbbing, preliminary screening tool, detect either, antigen, antibody in blood, screen, past infections, normal values depend on the type of substance health care provider is screening, people, a positive result normal, abnormal values depend on the type of substance health care provider is screening, people, a positive result normal, risks associated, venipuncture, slight, excessive bleeding, fainting, feeling light-headed, hematoma, blood accumulating under the skin, infection, a slight risk, the skin is broken, multiple punctures to locate veins, veins, arteries vary in size, obtaining a blood sample.