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New England · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Maine

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 Maine communities

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

Portland220,807Reverse T3 Test – rT3 TestingLewiston36,615Reverse T3 Test – rT3 TestingBangor31,920Reverse T3 Test – rT3 TestingSouth Portland26,428Reverse T3 Test – rT3 TestingAuburn23,790Reverse T3 Test – rT3 TestingBiddeford22,331Reverse T3 Test – rT3 TestingSanford21,812Reverse T3 Test – rT3 TestingSaco20,203Reverse T3 Test – rT3 TestingWestbrook20,074Reverse T3 Test – rT3 TestingAugusta18,895Reverse T3 Test – rT3 TestingWaterville15,872Reverse T3 Test – rT3 TestingBrewer9,606Reverse T3 Test – rT3 TestingPresque Isle8,859Reverse T3 Test – rT3 TestingBath8,718Reverse T3 Test – rT3 TestingEllsworth8,340Reverse T3 Test – rT3 TestingCaribou7,448Reverse T3 Test – rT3 TestingOld Town7,415Reverse T3 Test – rT3 TestingRockland6,977Reverse T3 Test – rT3 TestingBelfast6,890Reverse T3 Test – rT3 TestingGardiner5,944Reverse T3 Test – rT3 TestingNorth Windham5,395Reverse T3 Test – rT3 TestingLisbon Falls4,213Reverse T3 Test – rT3 TestingYork Harbor3,819Reverse T3 Test – rT3 TestingSouth Berwick3,596Reverse T3 Test – rT3 TestingLisbon3,456Reverse T3 Test – rT3 TestingSouth Eliot3,342Reverse T3 Test – rT3 TestingCalais3,010Reverse T3 Test – rT3 TestingLake Arrowhead3,007Reverse T3 Test – rT3 TestingCumberland Center2,956Reverse T3 Test – rT3 TestingHallowell2,542Reverse T3 Test – rT3 TestingCape Neddick2,485Reverse T3 Test – rT3 TestingSouth Paris2,169Reverse T3 Test – rT3 TestingDunstan1,852Reverse T3 Test – rT3 TestingFalmouth Foreside1,811Reverse T3 Test – rT3 TestingVeazie1,771Reverse T3 Test – rT3 TestingSteep Falls1,677Reverse T3 Test – rT3 TestingEastport1,226Reverse T3 Test – rT3 TestingWest Kennebunk1,119Reverse T3 Test – rT3 TestingCornish1,117Reverse T3 Test – rT3 TestingKittery Point1,017Reverse T3 Test – rT3 TestingChisholm1,007Reverse T3 Test – rT3 Testing