Mountain West · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Colorado

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 Colorado communities

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

Denver2,650,725Reverse T3 Test – rT3 Testing Colorado Springs628,808Reverse T3 Test – rT3 Testing Aurora383,496Reverse T3 Test – rT3 Testing Fort Collins301,596Reverse T3 Test – rT3 Testing Lakewood155,608Reverse T3 Test – rT3 Testing Pueblo142,727Reverse T3 Test – rT3 Testing Thornton140,538Reverse T3 Test – rT3 Testing Greeley135,270Reverse T3 Test – rT3 Testing Grand Junction134,074Reverse T3 Test – rT3 Testing Arvada122,903Reverse T3 Test – rT3 Testing Boulder120,818Reverse T3 Test – rT3 Testing Westminster115,535Reverse T3 Test – rT3 Testing Centennial107,972Reverse T3 Test – rT3 Testing Longmont104,035Reverse T3 Test – rT3 Testing Highlands Ranch103,238Reverse T3 Test – rT3 Testing Lafayette99,475Reverse T3 Test – rT3 Testing Loveland75,938Reverse T3 Test – rT3 Testing Broomfield72,697Reverse T3 Test – rT3 Testing Castle Rock71,037Reverse T3 Test – rT3 Testing Commerce City61,516Reverse T3 Test – rT3 Testing Parker57,311Reverse T3 Test – rT3 Testing Littleton45,465Reverse T3 Test – rT3 Testing Security-Widefield40,158Reverse T3 Test – rT3 Testing Brighton39,895Reverse T3 Test – rT3 Testing Northglenn37,899Reverse T3 Test – rT3 Testing Dakota Ridge34,361Reverse T3 Test – rT3 Testing Ken Caryl33,889Reverse T3 Test – rT3 Testing Englewood33,500Reverse T3 Test – rT3 Testing Pueblo West32,991Reverse T3 Test – rT3 Testing Wheat Ridge32,340Reverse T3 Test – rT3 Testing Windsor31,972Reverse T3 Test – rT3 Testing Fountain29,495Reverse T3 Test – rT3 Testing Erie29,367Reverse T3 Test – rT3 Testing Columbine25,924Reverse T3 Test – rT3 Testing Evans21,727Reverse T3 Test – rT3 Testing Four Square Mile21,723Reverse T3 Test – rT3 Testing Louisville21,091Reverse T3 Test – rT3 Testing Clifton20,122Reverse T3 Test – rT3 Testing Montrose20,098Reverse T3 Test – rT3 Testing Sherrelwood20,069Reverse T3 Test – rT3 Testing Golden20,041Reverse T3 Test – rT3 Testing Durango18,953Reverse T3 Test – rT3 Testing Cimarron Hills18,619Reverse T3 Test – rT3 Testing Cañon City17,157Reverse T3 Test – rT3 Testing Fort Carson16,743Reverse T3 Test – rT3 Testing Johnstown16,596Reverse T3 Test – rT3 Testing Welby16,260Reverse T3 Test – rT3 Testing Firestone15,949Reverse T3 Test – rT3 Testing Greenwood Village15,548Reverse T3 Test – rT3 Testing Black Forest14,375Reverse T3 Test – rT3 Testing Frederick14,127Reverse T3 Test – rT3 Testing Federal Heights14,111Reverse T3 Test – rT3 Testing Sterling13,976Reverse T3 Test – rT3 Testing Lone Tree13,701Reverse T3 Test – rT3 Testing Fruita13,296Reverse T3 Test – rT3 Testing Superior13,283Reverse T3 Test – rT3 Testing Steamboat Springs13,193Reverse T3 Test – rT3 Testing Fort Morgan11,483Reverse T3 Test – rT3 Testing Cherry Creek11,389Reverse T3 Test – rT3 Testing Castle Pines11,296Reverse T3 Test – rT3 Testing