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Terms in this set (76)

T3/serum triiodothyronine
-measure the T3 level in the blood
-normal 65 to 195 mg/dL
-accurate measure of thyroid function
-less stable than T4
-if T4 normal, but s/s of hyperthyroidism, T3 may indicate thyrotoxicosis
-oral contraceptives, steroids, estrogens, and sulfonamides withheld for several hours before test
-food and fluids ok
T4/serum thyroxine
-measures the T4 level in the blood
-normal 5 to 12 mcg/dL
-oral contraceptives, steroids, estrogens, and sulfonamides withheld for several hours before test
-food and fluids ok
-elevated levels=hyperthyroidism
FT4/free T4
-measures active component of total T4
-normal 1 to 3.5 ng/dL
-level remains constant so considered better indication of function than T4
-high FT4=hyperthyroidism
-low FT4=hypothyroidism
TSH/thyroid-stimulating hormone
-measure level of TSH
-normal 0.3 to 5.4 mcg/mL
-most sensitive method for evaluating thyroid disease
-first diagnostic test for thyroid dysfunction
-suppressed=hyperthyroidism
-elevated=hypothyroidism
RAIU/radioactive iodine uptake
-radioactive iodine I131 is given PO to fasting patient
-after 2, 6, and 24 hrs, a scintillation camera is held over the thyroid to measure how much of the isotope has been removed from the bloodstream
-hyperactive=remove 35% to 95%
-may be affected by prior ingestions of iodine
-signed consent form
-allergy to iodine
-no radiation precautions necessary
thyroid scan
-I131 given PO or IV
-scan done in 30 to 60 minutes
-scintillation camera positioned over the thyroid sends images that are received on an oscilloscope and printed out
-signed consent form
-no radiation precautions necessary
AHN 496