osmotic fragility…

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what the risks are osmotic fragility, test to detect abnormal fragility of red blood cells, blood is drawn, a vein, the elbow, the hand, puncture site is cleaned, antiseptic, aan elastic band, around the upper arm to apply pressure, restrict blood flow, the vein, veins to fill, blood, a needle is inserted, vein, blood is collected in an air-tight vial, a syringe, band is removed, restore circulation, once the blood has been collected, needle is removed, puncture site is covered to stop any bleeding, an infant, young child, area is cleansed, antiseptic, punctured, a sharp needle, a lancet, blood collected, pipette, small glass tube, on a slide, onto a test strip, into a small container, cotton, a bandage applied, puncture site, any continued bleeding, red blood cells, a solution that makes them swell, determine how fragile they, special considerations, no special preparation is necessary, infants, children, procedure depends on child's age, level of trust, specific information on how, 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, this test is performed to detect hereditary spherocytosis, thalassemia, hereditary spherocytosis, relatively common disorder characterized by red blood cells, intrinsically defective, sphere-like shape, cells have increased osmotic fragility, more fragile than normal, in thalassemia, red blood cells, more fragile than normal, a larger fraction, less fragile than normal, a negative test is normal, thalassemia, hereditary spherocytosis, 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, cells, spherical have a limited capacity to expand, withstand saltier water, rupturing than, normal red cells, indented, concave on both sides, spherical cells, said to have increased osmotic fragility, conversely, cells, flatter than normal have a greater capacity to expand, have decreased osmotic fragility, veins, arteries vary in size, obtaining a blood sample.