Mid-Atlantic · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Pennsylvania

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 Pennsylvania communities

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

Philadelphia5,512,873Reverse T3 Test – rT3 Testing Pittsburgh1,720,279Reverse T3 Test – rT3 Testing Allentown714,136Reverse T3 Test – rT3 Testing Harrisburg472,261Reverse T3 Test – rT3 Testing Lancaster430,621Reverse T3 Test – rT3 Testing Scranton376,974Reverse T3 Test – rT3 Testing Reading299,068Reverse T3 Test – rT3 Testing York236,818Reverse T3 Test – rT3 Testing Erie186,489Reverse T3 Test – rT3 Testing Pottstown115,413Reverse T3 Test – rT3 Testing State College88,526Reverse T3 Test – rT3 Testing Lebanon80,620Reverse T3 Test – rT3 Testing Bethlehem75,599Reverse T3 Test – rT3 Testing Altoona73,374Reverse T3 Test – rT3 Testing Hanover67,037Reverse T3 Test – rT3 Testing Levittown51,100Reverse T3 Test – rT3 Testing Wilkes-Barre44,086Reverse T3 Test – rT3 Testing Norristown35,607Reverse T3 Test – rT3 Testing Bethel Park33,356Reverse T3 Test – rT3 Testing Chester32,819Reverse T3 Test – rT3 Testing Hazleton29,339Reverse T3 Test – rT3 Testing Monroeville28,607Reverse T3 Test – rT3 Testing Drexel Hill28,538Reverse T3 Test – rT3 Testing Williamsport27,908Reverse T3 Test – rT3 Testing Easton27,860Reverse T3 Test – rT3 Testing Plum27,123Reverse T3 Test – rT3 Testing King of Prussia23,841Reverse T3 Test – rT3 Testing Allison Park23,160Reverse T3 Test – rT3 Testing Chambersburg22,141Reverse T3 Test – rT3 Testing New Castle21,992Reverse T3 Test – rT3 Testing Baldwin21,274Reverse T3 Test – rT3 Testing Murrysville20,810Reverse T3 Test – rT3 Testing Carlisle19,869Reverse T3 Test – rT3 Testing West Mifflin19,638Reverse T3 Test – rT3 Testing Johnstown18,647Reverse T3 Test – rT3 Testing West Chester18,592Reverse T3 Test – rT3 Testing Lansdale18,509Reverse T3 Test – rT3 Testing Phoenixville18,437Reverse T3 Test – rT3 Testing McKeesport17,935Reverse T3 Test – rT3 Testing Hermitage16,240Reverse T3 Test – rT3 Testing Colonial Park16,132Reverse T3 Test – rT3 Testing Fullerton16,131Reverse T3 Test – rT3 Testing Franklin Park15,239Reverse T3 Test – rT3 Testing Greensburg14,982Reverse T3 Test – rT3 Testing Hershey14,619Reverse T3 Test – rT3 Testing Weigelstown14,593Reverse T3 Test – rT3 Testing Wilkinsburg14,492Reverse T3 Test – rT3 Testing Ardmore14,391Reverse T3 Test – rT3 Testing Dunmore14,009Reverse T3 Test – rT3 Testing Willow Grove13,958Reverse T3 Test – rT3 Testing Ephrata13,767Reverse T3 Test – rT3 Testing Indiana13,573Reverse T3 Test – rT3 Testing Butler13,452Reverse T3 Test – rT3 Testing Pottsville13,413Reverse T3 Test – rT3 Testing Washington13,322Reverse T3 Test – rT3 Testing Coatesville13,306Reverse T3 Test – rT3 Testing Kingston13,304Reverse T3 Test – rT3 Testing Sharon13,203Reverse T3 Test – rT3 Testing Carnot-Moon13,196Reverse T3 Test – rT3 Testing Meadville12,999Reverse T3 Test – rT3 Testing