New England · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Massachusetts

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 Massachusetts communities

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

Boston4,208,580Reverse T3 Test – rT3 Testing Springfield620,494Reverse T3 Test – rT3 Testing Worcester573,573Reverse T3 Test – rT3 Testing New Bedford158,353Reverse T3 Test – rT3 Testing Leominster118,190Reverse T3 Test – rT3 Testing Cambridge116,892Reverse T3 Test – rT3 Testing Lowell114,804Reverse T3 Test – rT3 Testing Brockton104,216Reverse T3 Test – rT3 Testing Quincy100,544Reverse T3 Test – rT3 Testing Lynn100,233Reverse T3 Test – rT3 Testing Fall River93,339Reverse T3 Test – rT3 Testing Newton88,647Reverse T3 Test – rT3 Testing Lawrence87,798Reverse T3 Test – rT3 Testing Somerville80,608Reverse T3 Test – rT3 Testing Framingham72,089Reverse T3 Test – rT3 Testing Haverhill67,093Reverse T3 Test – rT3 Testing Malden65,602Reverse T3 Test – rT3 Testing Waltham64,655Reverse T3 Test – rT3 Testing Revere60,720Reverse T3 Test – rT3 Testing Medford60,708Reverse T3 Test – rT3 Testing Taunton59,076Reverse T3 Test – rT3 Testing Chicopee55,636Reverse T3 Test – rT3 Testing Peabody54,200Reverse T3 Test – rT3 Testing Methuen Town52,536Reverse T3 Test – rT3 Testing Everett48,368Reverse T3 Test – rT3 Testing Attleboro46,146Reverse T3 Test – rT3 Testing Salem44,452Reverse T3 Test – rT3 Testing Pittsfield43,890Reverse T3 Test – rT3 Testing Beverly42,448Reverse T3 Test – rT3 Testing Fitchburg41,796Reverse T3 Test – rT3 Testing Marlborough41,505Reverse T3 Test – rT3 Testing Woburn40,967Reverse T3 Test – rT3 Testing Westfield40,922Reverse T3 Test – rT3 Testing Chelsea40,025Reverse T3 Test – rT3 Testing Holyoke38,480Reverse T3 Test – rT3 Testing Watertown Town35,171Reverse T3 Test – rT3 Testing Gloucester29,814Reverse T3 Test – rT3 Testing Melrose29,567Reverse T3 Test – rT3 Testing Northampton29,379Reverse T3 Test – rT3 Testing Gardner21,183Reverse T3 Test – rT3 Testing Newburyport18,282Reverse T3 Test – rT3 Testing North Adams13,024Reverse T3 Test – rT3 Testing South Yarmouth11,696Reverse T3 Test – rT3 Testing Middleborough Center7,790Reverse T3 Test – rT3 Testing Mansfield Center7,689Reverse T3 Test – rT3 Testing Whitinsville7,329Reverse T3 Test – rT3 Testing West Concord7,003Reverse T3 Test – rT3 Testing Cochituate6,966Reverse T3 Test – rT3 Testing East Falmouth6,739Reverse T3 Test – rT3 Testing Pinehurst6,653Reverse T3 Test – rT3 Testing West Yarmouth6,124Reverse T3 Test – rT3 Testing Yarmouth Port5,872Reverse T3 Test – rT3 Testing Bliss Corner5,529Reverse T3 Test – rT3 Testing North Scituate5,519Reverse T3 Test – rT3 Testing East Harwich5,519Reverse T3 Test – rT3 Testing Raynham Center5,072Reverse T3 Test – rT3 Testing Smith Mills4,846Reverse T3 Test – rT3 Testing North Westport4,835Reverse T3 Test – rT3 Testing The Pinehills4,724Reverse T3 Test – rT3 Testing Millis-Clicquot4,653Reverse T3 Test – rT3 Testing