Mid-Atlantic · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in New York

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 New York communities

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

New York18,972,871Reverse T3 Test – rT3 Testing Brooklyn2,736,074Reverse T3 Test – rT3 Testing Queens2,405,464Reverse T3 Test – rT3 Testing Manhattan1,694,263Reverse T3 Test – rT3 Testing Bronx1,472,654Reverse T3 Test – rT3 Testing Buffalo1,004,655Reverse T3 Test – rT3 Testing Rochester737,309Reverse T3 Test – rT3 Testing Albany604,077Reverse T3 Test – rT3 Testing Staten Island495,747Reverse T3 Test – rT3 Testing Poughkeepsie423,386Reverse T3 Test – rT3 Testing Syracuse418,875Reverse T3 Test – rT3 Testing Yonkers209,730Reverse T3 Test – rT3 Testing Binghamton146,870Reverse T3 Test – rT3 Testing Utica112,948Reverse T3 Test – rT3 Testing New Rochelle80,685Reverse T3 Test – rT3 Testing Mount Vernon72,855Reverse T3 Test – rT3 Testing Schenectady66,809Reverse T3 Test – rT3 Testing Saratoga Springs66,290Reverse T3 Test – rT3 Testing Brentwood66,035Reverse T3 Test – rT3 Testing Glens Falls66,024Reverse T3 Test – rT3 Testing Elmira63,404Reverse T3 Test – rT3 Testing White Plains59,452Reverse T3 Test – rT3 Testing Levittown52,540Reverse T3 Test – rT3 Testing Troy50,717Reverse T3 Test – rT3 Testing Niagara Falls48,763Reverse T3 Test – rT3 Testing Freeport44,328Reverse T3 Test – rT3 Testing West Babylon43,397Reverse T3 Test – rT3 Testing Hicksville43,107Reverse T3 Test – rT3 Testing Coram41,431Reverse T3 Test – rT3 Testing Valley Stream40,304Reverse T3 Test – rT3 Testing East Meadow38,078Reverse T3 Test – rT3 Testing Elmont36,741Reverse T3 Test – rT3 Testing Central Islip36,292Reverse T3 Test – rT3 Testing Commack36,252Reverse T3 Test – rT3 Testing Long Beach34,820Reverse T3 Test – rT3 Testing New City34,118Reverse T3 Test – rT3 Testing Huntington Station34,050Reverse T3 Test – rT3 Testing Baldwin33,352Reverse T3 Test – rT3 Testing Spring Valley32,953Reverse T3 Test – rT3 Testing Uniondale32,791Reverse T3 Test – rT3 Testing Kiryas Joel32,498Reverse T3 Test – rT3 Testing Franklin Square32,381Reverse T3 Test – rT3 Testing Rome32,309Reverse T3 Test – rT3 Testing Centereach31,979Reverse T3 Test – rT3 Testing Ithaca31,819Reverse T3 Test – rT3 Testing Bay Shore31,488Reverse T3 Test – rT3 Testing Port Chester31,317Reverse T3 Test – rT3 Testing Oceanside31,182Reverse T3 Test – rT3 Testing North Tonawanda30,592Reverse T3 Test – rT3 Testing Middletown30,086Reverse T3 Test – rT3 Testing Jamestown28,818Reverse T3 Test – rT3 Testing Harrison28,635Reverse T3 Test – rT3 Testing Glen Cove28,187Reverse T3 Test – rT3 Testing Shirley28,059Reverse T3 Test – rT3 Testing West Islip27,557Reverse T3 Test – rT3 Testing Monsey27,359Reverse T3 Test – rT3 Testing Lindenhurst27,169Reverse T3 Test – rT3 Testing Holbrook26,958Reverse T3 Test – rT3 Testing Auburn26,913Reverse T3 Test – rT3 Testing Deer Park26,803Reverse T3 Test – rT3 Testing