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Pacific · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Washington

This page explains the reverse t3 test – rt3 testing, what it measures, and how to order it. The Reverse T3 Test measures the level of reverse triiodothyronine in the blood to assess thyroid function under certain conditions.

Sample typeBlood draw at a collection lab
ReferralNo referral required

What this test is

The Reverse T3 Test is a blood test that evaluates the level of reverse triiodothyronine (rT3), a hormone related to thyroid function. It is often used to assess thyroid activity in the context of nonthyroidal illness syndrome.

What it measures

  • Reverse T3 — reflects the body's conversion of thyroxine (T4) to triiodothyronine (T3)

What the test involves

The test involves a standard blood draw, typically from a vein in the arm. The collected sample is then analyzed in a laboratory.

Why it is often ordered

Clinicians may order this test to investigate thyroid function when a patient has symptoms that suggest abnormal thyroid activity. It helps differentiate between thyroid disorders and other conditions affecting thyroid hormone levels.

Preparation

Preparation for the Reverse T3 Test may vary, so it is important to follow the specific instructions provided by the laboratory conducting the test.

How results are reported

Results of the Reverse T3 Test are reported as a concentration of rT3 in the blood. Reference ranges can vary between laboratories, so results should be interpreted in context.

Before you go

  • Sample collection method
  • Preparation instructions
  • Turnaround time

Cities

Reverse T3 Test – rT3 Testing in Washington communities

Choose your city for local context and to request this test.

Seattle3,438,221Reverse T3 Test – rT3 TestingSpokane440,270Reverse T3 Test – rT3 TestingKennewick241,230Reverse T3 Test – rT3 TestingBremerton219,538Reverse T3 Test – rT3 TestingTacoma217,332Reverse T3 Test – rT3 TestingOlympia200,836Reverse T3 Test – rT3 TestingVancouver188,331Reverse T3 Test – rT3 TestingMarysville164,655Reverse T3 Test – rT3 TestingBellevue149,365Reverse T3 Test – rT3 TestingKent134,890Reverse T3 Test – rT3 TestingYakima130,440Reverse T3 Test – rT3 TestingBellingham129,601Reverse T3 Test – rT3 TestingEverett110,438Reverse T3 Test – rT3 TestingRenton105,313Reverse T3 Test – rT3 TestingSpokane Valley102,178Reverse T3 Test – rT3 TestingFederal Way99,792Reverse T3 Test – rT3 TestingKirkland91,656Reverse T3 Test – rT3 TestingAuburn85,306Reverse T3 Test – rT3 TestingPasco76,398Reverse T3 Test – rT3 TestingRedmond72,166Reverse T3 Test – rT3 TestingWenatchee71,119Reverse T3 Test – rT3 TestingLongview67,958Reverse T3 Test – rT3 TestingMount Vernon67,767Reverse T3 Test – rT3 TestingSouth Hill66,713Reverse T3 Test – rT3 TestingSammamish66,532Reverse T3 Test – rT3 TestingLakewood62,972Reverse T3 Test – rT3 TestingRichland59,718Reverse T3 Test – rT3 TestingShoreline58,213Reverse T3 Test – rT3 TestingLacey52,572Reverse T3 Test – rT3 TestingBurien51,646Reverse T3 Test – rT3 TestingBothell47,355Reverse T3 Test – rT3 TestingEdmonds42,622Reverse T3 Test – rT3 TestingPuyallup42,366Reverse T3 Test – rT3 TestingIssaquah39,057Reverse T3 Test – rT3 TestingLynnwood38,812Reverse T3 Test – rT3 TestingParkland38,092Reverse T3 Test – rT3 TestingLake Stevens35,135Reverse T3 Test – rT3 TestingSpanaway34,670Reverse T3 Test – rT3 TestingUniversity Place34,565Reverse T3 Test – rT3 TestingWalla Walla33,765Reverse T3 Test – rT3 TestingGraham33,727Reverse T3 Test – rT3 TestingPullman32,968Reverse T3 Test – rT3 TestingDes Moines32,631Reverse T3 Test – rT3 TestingSeaTac30,867Reverse T3 Test – rT3 TestingOrchards28,371Reverse T3 Test – rT3 TestingMaple Valley27,643Reverse T3 Test – rT3 TestingCamas25,774Reverse T3 Test – rT3 TestingMill Creek East25,528Reverse T3 Test – rT3 TestingMercer Island25,506Reverse T3 Test – rT3 TestingTumwater24,855Reverse T3 Test – rT3 TestingMoses Lake24,764Reverse T3 Test – rT3 TestingNorth Lynnwood24,562Reverse T3 Test – rT3 TestingBainbridge Island24,557Reverse T3 Test – rT3 TestingOak Harbor24,267Reverse T3 Test – rT3 TestingKenmore23,556Reverse T3 Test – rT3 TestingEastmont23,088Reverse T3 Test – rT3 TestingUnion Hill-Novelty Hill23,060Reverse T3 Test – rT3 TestingCottage Lake22,779Reverse T3 Test – rT3 TestingMartha Lake22,251Reverse T3 Test – rT3 TestingBonney Lake22,229Reverse T3 Test – rT3 Testing