Southwest · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Arizona

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 Arizona communities

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

Phoenix4,047,095Reverse T3 Test – rT3 Testing Tucson875,284Reverse T3 Test – rT3 Testing Mesa497,752Reverse T3 Test – rT3 Testing Chandler272,439Reverse T3 Test – rT3 Testing Gilbert262,249Reverse T3 Test – rT3 Testing Avondale254,537Reverse T3 Test – rT3 Testing Glendale245,685Reverse T3 Test – rT3 Testing Scottsdale238,685Reverse T3 Test – rT3 Testing Peoria187,733Reverse T3 Test – rT3 Testing Tempe178,862Reverse T3 Test – rT3 Testing Surprise141,875Reverse T3 Test – rT3 Testing Yuma135,933Reverse T3 Test – rT3 Testing Prescott Valley97,901Reverse T3 Test – rT3 Testing San Tan Valley96,127Reverse T3 Test – rT3 Testing Goodyear93,651Reverse T3 Test – rT3 Testing Buckeye89,711Reverse T3 Test – rT3 Testing Flagstaff81,682Reverse T3 Test – rT3 Testing Casas Adobes70,224Reverse T3 Test – rT3 Testing Queen Creek57,728Reverse T3 Test – rT3 Testing Maricopa57,075Reverse T3 Test – rT3 Testing Lake Havasu City56,510Reverse T3 Test – rT3 Testing Casa Grande53,488Reverse T3 Test – rT3 Testing Marana50,834Reverse T3 Test – rT3 Testing Catalina Foothills50,096Reverse T3 Test – rT3 Testing Oro Valley46,515Reverse T3 Test – rT3 Testing Prescott45,063Reverse T3 Test – rT3 Testing Sierra Vista44,944Reverse T3 Test – rT3 Testing Bullhead City41,064Reverse T3 Test – rT3 Testing Apache Junction38,311Reverse T3 Test – rT3 Testing Sun City37,693Reverse T3 Test – rT3 Testing El Mirage35,410Reverse T3 Test – rT3 Testing San Luis35,289Reverse T3 Test – rT3 Testing Sahuarita33,524Reverse T3 Test – rT3 Testing Kingman32,204Reverse T3 Test – rT3 Testing Drexel Heights30,599Reverse T3 Test – rT3 Testing Fortuna Foothills26,727Reverse T3 Test – rT3 Testing Sun City West26,354Reverse T3 Test – rT3 Testing Florence25,356Reverse T3 Test – rT3 Testing Fountain Hills23,639Reverse T3 Test – rT3 Testing Anthem22,750Reverse T3 Test – rT3 Testing Rio Rico20,914Reverse T3 Test – rT3 Testing Green Valley20,729Reverse T3 Test – rT3 Testing Nogales19,829Reverse T3 Test – rT3 Testing New River17,731Reverse T3 Test – rT3 Testing Flowing Wells16,965Reverse T3 Test – rT3 Testing Douglas16,470Reverse T3 Test – rT3 Testing Payson16,229Reverse T3 Test – rT3 Testing Fort Mohave15,872Reverse T3 Test – rT3 Testing Eloy15,171Reverse T3 Test – rT3 Testing Tanque Verde14,946Reverse T3 Test – rT3 Testing Sierra Vista Southeast14,822Reverse T3 Test – rT3 Testing Vail14,715Reverse T3 Test – rT3 Testing Somerton14,126Reverse T3 Test – rT3 Testing Sun Lakes13,912Reverse T3 Test – rT3 Testing Coolidge13,347Reverse T3 Test – rT3 Testing Valencia West12,887Reverse T3 Test – rT3 Testing New Kingman-Butler12,858Reverse T3 Test – rT3 Testing Chino Valley12,854Reverse T3 Test – rT3 Testing Paradise Valley12,666Reverse T3 Test – rT3 Testing Verde Village12,658Reverse T3 Test – rT3 Testing