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RT3U
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RT3U
Alternative Names:
T3RU; Resin T3 uptake; T3 resin uptake; Thyroid hormone-binding ratio
Normal Values:
24% to 37%
What abnormal results mean:
Greater-than-normal levels may indicate:
hyperthyroidism
nephrotic syndrome
protein malnutrition
renal failure
Lower-than-normal levels may indicate:
acute
hepatitis
hypothyroidism
hypothyroidism; primary
hypothyroidism; secondary
pregnancy
estrogen administration
Additional conditions under which the test may be performed:
chronic thyroiditis (Hashimoto's disease)
drug-induced hypothyroidism
Graves' disease
subacute thyroiditis
thyrotoxic periodic paralysis
toxic nodular goiter
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