South · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Texas

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 Texas communities

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

Dallas5,668,165Reverse T3 Test – rT3 Testing Houston5,650,910Reverse T3 Test – rT3 Testing San Antonio1,910,785Reverse T3 Test – rT3 Testing Austin1,659,251Reverse T3 Test – rT3 Testing Fort Worth908,469Reverse T3 Test – rT3 Testing McAllen809,002Reverse T3 Test – rT3 Testing El Paso794,344Reverse T3 Test – rT3 Testing Denton445,814Reverse T3 Test – rT3 Testing Arlington392,304Reverse T3 Test – rT3 Testing Corpus Christi333,764Reverse T3 Test – rT3 Testing The Woodlands292,380Reverse T3 Test – rT3 Testing Plano282,181Reverse T3 Test – rT3 Testing Lubbock259,946Reverse T3 Test – rT3 Testing Laredo256,748Reverse T3 Test – rT3 Testing Irving254,184Reverse T3 Test – rT3 Testing McKinney248,840Reverse T3 Test – rT3 Testing Garland245,075Reverse T3 Test – rT3 Testing Killeen238,288Reverse T3 Test – rT3 Testing Brownsville235,735Reverse T3 Test – rT3 Testing College Station207,514Reverse T3 Test – rT3 Testing Amarillo204,357Reverse T3 Test – rT3 Testing Grand Prairie195,992Reverse T3 Test – rT3 Testing Frisco193,140Reverse T3 Test – rT3 Testing Waco187,172Reverse T3 Test – rT3 Testing Port Arthur156,988Reverse T3 Test – rT3 Testing Pasadena151,964Reverse T3 Test – rT3 Testing Mesquite149,848Reverse T3 Test – rT3 Testing Harlingen148,545Reverse T3 Test – rT3 Testing Tyler143,895Reverse T3 Test – rT3 Testing Beaumont137,549Reverse T3 Test – rT3 Testing Odessa134,793Reverse T3 Test – rT3 Testing Carrollton131,388Reverse T3 Test – rT3 Testing Midland130,765Reverse T3 Test – rT3 Testing Abilene125,474Reverse T3 Test – rT3 Testing Pearland122,609Reverse T3 Test – rT3 Testing Texas City122,017Reverse T3 Test – rT3 Testing Round Rock117,735Reverse T3 Test – rT3 Testing Richardson115,904Reverse T3 Test – rT3 Testing Temple115,809Reverse T3 Test – rT3 Testing League City111,847Reverse T3 Test – rT3 Testing Sugar Land110,272Reverse T3 Test – rT3 Testing Lewisville110,077Reverse T3 Test – rT3 Testing Allen102,778Reverse T3 Test – rT3 Testing Wichita Falls102,563Reverse T3 Test – rT3 Testing San Angelo100,330Reverse T3 Test – rT3 Testing Edinburg98,759Reverse T3 Test – rT3 Testing Longview98,075Reverse T3 Test – rT3 Testing Conroe87,930Reverse T3 Test – rT3 Testing New Braunfels87,549Reverse T3 Test – rT3 Testing Mission85,311Reverse T3 Test – rT3 Testing Bryan85,204Reverse T3 Test – rT3 Testing Atascocita84,222Reverse T3 Test – rT3 Testing Baytown82,543Reverse T3 Test – rT3 Testing Texarkana79,304Reverse T3 Test – rT3 Testing Pharr78,997Reverse T3 Test – rT3 Testing Flower Mound75,050Reverse T3 Test – rT3 Testing Cedar Park74,741Reverse T3 Test – rT3 Testing Missouri City73,682Reverse T3 Test – rT3 Testing Lake Jackson73,478Reverse T3 Test – rT3 Testing Mansfield71,375Reverse T3 Test – rT3 Testing