Midwest · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Missouri

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 Missouri communities

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

St. Louis2,092,481Reverse T3 Test – rT3 Testing Kansas City1,644,497Reverse T3 Test – rT3 Testing Springfield298,722Reverse T3 Test – rT3 Testing Columbia136,736Reverse T3 Test – rT3 Testing Independence122,230Reverse T3 Test – rT3 Testing Lee's Summit100,772Reverse T3 Test – rT3 Testing O'Fallon90,802Reverse T3 Test – rT3 Testing Joplin81,025Reverse T3 Test – rT3 Testing St. Joseph80,099Reverse T3 Test – rT3 Testing St. Charles70,218Reverse T3 Test – rT3 Testing Blue Springs58,265Reverse T3 Test – rT3 Testing St. Peters57,289Reverse T3 Test – rT3 Testing Florissant52,382Reverse T3 Test – rT3 Testing Chesterfield49,675Reverse T3 Test – rT3 Testing Wentzville43,213Reverse T3 Test – rT3 Testing Jefferson City43,076Reverse T3 Test – rT3 Testing Cape Girardeau39,415Reverse T3 Test – rT3 Testing Wildwood35,384Reverse T3 Test – rT3 Testing Oakville35,357Reverse T3 Test – rT3 Testing University City34,953Reverse T3 Test – rT3 Testing Ballwin30,998Reverse T3 Test – rT3 Testing Liberty30,129Reverse T3 Test – rT3 Testing Raytown29,893Reverse T3 Test – rT3 Testing Kirkwood29,233Reverse T3 Test – rT3 Testing Mehlville28,672Reverse T3 Test – rT3 Testing Maryland Heights28,141Reverse T3 Test – rT3 Testing Gladstone26,825Reverse T3 Test – rT3 Testing Grandview25,931Reverse T3 Test – rT3 Testing Hazelwood25,466Reverse T3 Test – rT3 Testing Belton23,832Reverse T3 Test – rT3 Testing Webster Groves23,817Reverse T3 Test – rT3 Testing Nixa22,925Reverse T3 Test – rT3 Testing Raymore22,722Reverse T3 Test – rT3 Testing Sedalia21,696Reverse T3 Test – rT3 Testing Ozark20,874Reverse T3 Test – rT3 Testing Arnold20,808Reverse T3 Test – rT3 Testing Old Jamestown20,382Reverse T3 Test – rT3 Testing Rolla19,949Reverse T3 Test – rT3 Testing Warrensburg19,509Reverse T3 Test – rT3 Testing Affton18,925Reverse T3 Test – rT3 Testing Ferguson18,826Reverse T3 Test – rT3 Testing Concord18,760Reverse T3 Test – rT3 Testing Creve Coeur18,648Reverse T3 Test – rT3 Testing Republic18,313Reverse T3 Test – rT3 Testing Manchester18,308Reverse T3 Test – rT3 Testing Farmington17,959Reverse T3 Test – rT3 Testing Spanish Lake17,721Reverse T3 Test – rT3 Testing Kirksville17,600Reverse T3 Test – rT3 Testing Hannibal17,165Reverse T3 Test – rT3 Testing Clayton16,905Reverse T3 Test – rT3 Testing Lake St. Louis16,665Reverse T3 Test – rT3 Testing Poplar Bluff16,318Reverse T3 Test – rT3 Testing Lemay16,312Reverse T3 Test – rT3 Testing Sikeston16,054Reverse T3 Test – rT3 Testing Overland15,908Reverse T3 Test – rT3 Testing Fort Leonard Wood15,629Reverse T3 Test – rT3 Testing Grain Valley15,435Reverse T3 Test – rT3 Testing Carthage15,395Reverse T3 Test – rT3 Testing Jackson15,272Reverse T3 Test – rT3 Testing Lebanon14,880Reverse T3 Test – rT3 Testing