South · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Louisiana

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 Louisiana communities

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

New Orleans925,443Reverse T3 Test – rT3 Testing Baton Rouge610,751Reverse T3 Test – rT3 Testing Shreveport286,200Reverse T3 Test – rT3 Testing Lafayette254,286Reverse T3 Test – rT3 Testing Lake Charles150,036Reverse T3 Test – rT3 Testing Houma146,665Reverse T3 Test – rT3 Testing Metairie140,590Reverse T3 Test – rT3 Testing Monroe117,197Reverse T3 Test – rT3 Testing Mandeville105,097Reverse T3 Test – rT3 Testing Slidell94,498Reverse T3 Test – rT3 Testing Alexandria75,835Reverse T3 Test – rT3 Testing Hammond75,688Reverse T3 Test – rT3 Testing Kenner66,411Reverse T3 Test – rT3 Testing Bossier City63,168Reverse T3 Test – rT3 Testing Prairieville34,118Reverse T3 Test – rT3 Testing Marrero31,928Reverse T3 Test – rT3 Testing Central29,746Reverse T3 Test – rT3 Testing Laplace29,129Reverse T3 Test – rT3 Testing New Iberia28,844Reverse T3 Test – rT3 Testing Terrytown25,388Reverse T3 Test – rT3 Testing Ruston22,286Reverse T3 Test – rT3 Testing Chalmette21,981Reverse T3 Test – rT3 Testing Bayou Cane21,699Reverse T3 Test – rT3 Testing Sulphur21,490Reverse T3 Test – rT3 Testing Harvey20,942Reverse T3 Test – rT3 Testing Shenandoah20,068Reverse T3 Test – rT3 Testing Zachary19,278Reverse T3 Test – rT3 Testing Natchitoches18,105Reverse T3 Test – rT3 Testing Gretna17,836Reverse T3 Test – rT3 Testing Estelle17,650Reverse T3 Test – rT3 Testing Opelousas15,884Reverse T3 Test – rT3 Testing Thibodaux15,242Reverse T3 Test – rT3 Testing Youngsville15,167Reverse T3 Test – rT3 Testing Pineville14,653Reverse T3 Test – rT3 Testing Luling14,115Reverse T3 Test – rT3 Testing River Ridge13,435Reverse T3 Test – rT3 Testing Claiborne13,147Reverse T3 Test – rT3 Testing West Monroe13,103Reverse T3 Test – rT3 Testing Broussard12,960Reverse T3 Test – rT3 Testing Baker12,736Reverse T3 Test – rT3 Testing Minden12,145Reverse T3 Test – rT3 Testing Gonzales12,080Reverse T3 Test – rT3 Testing Crowley11,916Reverse T3 Test – rT3 Testing Destrehan11,827Reverse T3 Test – rT3 Testing Morgan City11,525Reverse T3 Test – rT3 Testing Moss Bluff11,453Reverse T3 Test – rT3 Testing Woodmere11,343Reverse T3 Test – rT3 Testing Abbeville11,313Reverse T3 Test – rT3 Testing Bayou Blue11,229Reverse T3 Test – rT3 Testing Waggaman11,161Reverse T3 Test – rT3 Testing Covington11,155Reverse T3 Test – rT3 Testing Raceland11,002Reverse T3 Test – rT3 Testing Gardere10,971Reverse T3 Test – rT3 Testing Bogalusa10,921Reverse T3 Test – rT3 Testing Timberlane10,697Reverse T3 Test – rT3 Testing Jefferson10,500Reverse T3 Test – rT3 Testing Belle Chasse10,406Reverse T3 Test – rT3 Testing DeRidder10,060Reverse T3 Test – rT3 Testing Bastrop9,879Reverse T3 Test – rT3 Testing Jennings9,836Reverse T3 Test – rT3 Testing