Reverse T3 Dominance Testing

Unfortunately blood tests for T3 measure both normal T3 and reverse T3 as testing does not distinguish between the two. T3 levels may appear normal, however a significant proportion may include inactive reverse T3. This provides a false diagnosis of true thyroid gland function.

To overcome this diagnostic problem there is a special test that specifically measures reverse T3 alone and should be requested to rule out reverse T3 dominance.

Note: Long term use of T4 medication can result in high levels of reverse T3.

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