Thyroxine T4
T3 Uptake
FREE T4 INDEX (T7)
Thyroid Stimulating Hormone (TSH)

THYROXINE (T4) - Increased levels are found in hyperthyroidism, acute thyroiditis, and hepatitis. Low levels can be found in Cretinism, hypothyroidism, cirrhosis, malnutrition, and chronic thyroiditis.

Normal Adult Range: 4 - 12 ug/dl
Optimal Adult Reading: 8 ug/dl

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T3-UPTAKE - Increased levels are found in hyperthyroidism, severe liver disease, metastatic malignancy, and pulmonary insufficiency. Decreased levels are found in hypothyroidism, normal pregnancy, and hyperestrogenis status.

Normal Adult Range: 27 - 47%
Optimal Adult Reading: 37 %

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FREE T4 INDEX (T7)

Normal Adult Range: 4 - 12
Optimal Adult Reading: 8

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THYROID-STIMULATING HORMONE (TSH) - produced by the anterior pituitary gland, causes the release and distribution of stored thyroid hormones. When T4 and T3 are too high, TSH secretion decreases, when T4 and T3 are low, TSH secretion increases.

Normal Adult Range: 0.3 to 3.04 miliIU/L

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