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The normal range of TSH levels in adults is between 0.4 to 4.0 mIU/L (milli-international units per liter). Some research suggests that this range should actually be more like 0.45 to...
Assessing thyroid hormone levels based on thyroid function tests is straightforward. Here is a look at optimal thyroid levels for TSH, Free T4, and Free T3.
Download this guide for a full overview of each thyroid function test, its optimal range, and what the results mean.
Optimal TPO reference range: <2 IU/mL. Optimal TG reference range: <2 IU/mL. Optimal TSI reference range: < 0.55 IU/L or <130 percent of baseline. Optimal TBII reference range: ≤2.00 IU/L or 16 to 100 percent inhibition of TSH binding
The Optimal Thyroid Levels. Even if your doctor does order a complete thyroid function test panel, they’re usually relying on “normal” thyroid test results reference ranges that are too broad and often inaccurate.
Normal thyroid-stimulating hormone (TSH) levels generally fall between 0.4 and 4.5 milliunits per liter (mU/L). TSH levels higher than 4.5 mU/L usually indicate an underactive thyroid (hypothyroidism), and low TSH levels—below 0.4 mU/L—indicate an overactive thyroid (hyperthyroidism).
The results of thyroid blood tests are described in a reference range of values. The reference range has a high and low value between which results are considered normal. Values near the upper or lower limit are borderline, while anything outside of these limits is considered abnormal.
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