t4 test…

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what the risks are blood test, thyroxine test, test measures the amount, a hormone, in the blood, t4, produced by the thyroid gland, blood is drawn, a vein on the inside, the elbow, the hand, puncture site is cleaned, antiseptic, an elastic band, around the upper arm to apply pressure, restrict blood flow, the vein, veins below the band to swell, 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, health care provider, advise to stop taking drugs, affect the test, "special considerations", infants, children, test depends on child's age, 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 performed, part of an evaluation of thyroid function, thyroid function is complex, depends on the action of many different hormones, thyroid-stimulating hormone, tsh, secreted by the pituitary gland, tsh causes, thyroid gland to produce two more hormones, t4, thyroxine, t3, triiodothyronine, tsh is stimulated by another hormone, thyroid-releasing hormone, trh, is made by the hypothalamus, normal thyroid function, having enough t3, t4 inhibits both tsh, trh, prevents the body from making too much t3, t4, t4 levels, t4 increases numerous enzymes that produce energy, most t3, t4 is transported by a protein, tbg, thyroxine binding globulin, smaller amounts, found on prealbumin, albumin, not bound to proteins, "free" t3, t4, normal values vary among different laboratories, a typical normal range, 4.5 to 11.2 mcg/dl, micrograms per deciliter, greater-than-normal levels of t4, low levels of tsh, indicate hyperthyroid conditions, graves' disease, toxic multinodular goiter, subacute, chronic thyroiditis, early hashimoto's disease, iodine-induced hyperthyroidism, germ cell tumors, trophoblastic disease, lower-than-normal levels of t4, hypothyroidism, hashimoto's disease, cretinism, myxedema, goitrous diseases, scleroderma, amyloid goiter, hemochromatosis following neck irradiation, head, neck cancer, malnutrition, fasting, illness throughout the body, use of certain, dexamethasone, propranolol, lithium, iodine, methimazole, propylthiouracil, interferon alfa, interleukin-2, amiodarone, additional conditions under which the test performed, goiter, hypopituitarism, hypothyroidism, primary, hypothyroidism, secondary, thyrotoxic periodic paralysis risks associated, having blood drawn, slight, excessive bleeding, fainting, feeling lightheaded, hematoma, blood accumulating under the skin, infection, a slight risk, the skin is broken, multiple punctures to locate veins, drugs, increase t4 measurements include clofibrate, estrogens, methadone, amiodarone, birth control pills, drugs, decrease t4 measurements include anabolic steroids, androgens, antithyroid drugs, propylthiouracil, methimazole, lithium, phenytoin, propranolol, amiodarone, interferon alpha, interleukin-2, veins, arteries vary in size, obtaining a blood sample.