Mountain West · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Montana

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 Montana communities

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

Billings124,973Reverse T3 Test – rT3 Testing Missoula92,863Reverse T3 Test – rT3 Testing Great Falls62,112Reverse T3 Test – rT3 Testing Bozeman51,574Reverse T3 Test – rT3 Testing Butte34,368Reverse T3 Test – rT3 Testing Helena32,060Reverse T3 Test – rT3 Testing Kalispell24,260Reverse T3 Test – rT3 Testing Belgrade10,555Reverse T3 Test – rT3 Testing Havre9,417Reverse T3 Test – rT3 Testing Anaconda9,380Reverse T3 Test – rT3 Testing Helena Valley Southeast9,316Reverse T3 Test – rT3 Testing Helena Valley West Central8,550Reverse T3 Test – rT3 Testing Miles City8,441Reverse T3 Test – rT3 Testing Livingston8,110Reverse T3 Test – rT3 Testing Evergreen7,988Reverse T3 Test – rT3 Testing Whitefish7,783Reverse T3 Test – rT3 Testing Laurel7,164Reverse T3 Test – rT3 Testing Lockwood7,162Reverse T3 Test – rT3 Testing Sidney6,240Reverse T3 Test – rT3 Testing Lewistown5,967Reverse T3 Test – rT3 Testing Four Corners5,649Reverse T3 Test – rT3 Testing Columbia Falls5,304Reverse T3 Test – rT3 Testing Orchard Homes5,170Reverse T3 Test – rT3 Testing Polson5,161Reverse T3 Test – rT3 Testing Glendive4,928Reverse T3 Test – rT3 Testing Bigfork4,683Reverse T3 Test – rT3 Testing Helena Valley Northwest4,653Reverse T3 Test – rT3 Testing Hamilton4,632Reverse T3 Test – rT3 Testing Lolo4,338Reverse T3 Test – rT3 Testing Malmstrom AFB4,098Reverse T3 Test – rT3 Testing Dillon3,930Reverse T3 Test – rT3 Testing Hardin3,754Reverse T3 Test – rT3 Testing Helena Valley Northeast3,607Reverse T3 Test – rT3 Testing North Browning3,253Reverse T3 Test – rT3 Testing Glasgow3,192Reverse T3 Test – rT3 Testing Big Sky3,141Reverse T3 Test – rT3 Testing Shelby3,139Reverse T3 Test – rT3 Testing Cut Bank3,049Reverse T3 Test – rT3 Testing Deer Lodge2,938Reverse T3 Test – rT3 Testing Conrad2,758Reverse T3 Test – rT3 Testing Libby2,745Reverse T3 Test – rT3 Testing Montana City2,735Reverse T3 Test – rT3 Testing Wolf Point2,638Reverse T3 Test – rT3 Testing Lakeside2,463Reverse T3 Test – rT3 Testing Lame Deer2,231Reverse T3 Test – rT3 Testing Townsend2,224Reverse T3 Test – rT3 Testing East Missoula2,162Reverse T3 Test – rT3 Testing Colstrip2,094Reverse T3 Test – rT3 Testing Three Forks2,084Reverse T3 Test – rT3 Testing Columbus2,069Reverse T3 Test – rT3 Testing Pablo2,037Reverse T3 Test – rT3 Testing Red Lodge2,032Reverse T3 Test – rT3 Testing Malta2,031Reverse T3 Test – rT3 Testing Crow Agency1,993Reverse T3 Test – rT3 Testing Stevensville1,959Reverse T3 Test – rT3 Testing King Arthur Park1,951Reverse T3 Test – rT3 Testing Clancy1,902Reverse T3 Test – rT3 Testing Manhattan1,884Reverse T3 Test – rT3 Testing West Glendive1,868Reverse T3 Test – rT3 Testing Choteau1,826Reverse T3 Test – rT3 Testing