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Mountain West · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Wyoming

This page explains the reverse t3 test – rt3 testing, what it measures, and how to order it. The Reverse T3 blood test measures a form of thyroid hormone that can help clarify unusual thyroid function test results. It is often used alongside other thyroid tests to give a fuller picture of how the body is handling thyroid hormone.

Sample typeBlood and/or urine at a collection lab
ReferralIncluded — no referral from your own doctor needed

Lab requirements in Wyoming

Here is what you need before ordering and completing the Reverse T3 Test – rT3 Testing in WY. Review each item and confirm the details with the collection lab.

Physician's order
Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
Fasting
Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
Preparation
Preparation instructions can vary depending on the laboratory and the other tests being performed at the same time. Always follow the specific instructions provided by the collection lab or…
Sample & visit
A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
Identification
Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
Turnaround
1-3 business days
Availability
Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.

Before you go

  • Order your test before visiting a lab, then use the requisition form in your account.
  • Print the requisition form, or fax it to the lab directly from your account.
  • No scheduling is needed — visit the collection lab during its normal business hours.
  • A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
  • Bring a government-issued photo ID in case the lab requests it.
  • Results are posted to your secure account within 1–3 business days.

Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.

What this test is

Reverse T3 is a biologically inactive form of thyroid hormone produced when the body converts thyroxine (T4) in an alternative pathway. This test measures the amount of reverse T3 circulating in the blood. It is not a stand-alone diagnostic test but is interpreted with other thyroid hormone measurements.

What it measures

  • Reverse T3 — reflects the amount of this inactive thyroid hormone form in the blood
  • Total T3 — often measured alongside to assess active thyroid hormone levels
  • Free T4 — helps evaluate the main thyroid hormone produced by the thyroid gland
  • TSH — indicates how the pituitary gland is responding to thyroid hormone levels

What the test involves

A healthcare professional collects a small sample of blood, usually from a vein in your arm, using a standard blood draw. The sample is then sent to a laboratory for analysis.

Why it is often ordered

A clinician may order a reverse T3 test when thyroid test results are confusing or when a nonthyroidal illness is suspected. It is typically used to help evaluate whether symptoms or abnormal thyroid tests might be related to how the body is converting thyroid hormones.

Preparation

Preparation instructions can vary depending on the laboratory and the other tests being performed at the same time. Always follow the specific instructions provided by the collection lab or your healthcare provider.

How results are reported

Results are reported as a numeric value for reverse T3, and the laboratory will provide a reference range for comparison. Reference ranges can differ between laboratories because of differences in equipment, methods, and population, so your result should be interpreted using the range from the lab that performed the test.

Before you go

  • Whether any other tests will be drawn at the same time and if fasting is required.
  • The specific reference range used by the laboratory performing the test.
  • How and when you will receive your results.

Cities

Reverse T3 Test – rT3 Testing in Wyoming communities

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

Cheyenne76,456Reverse T3 Test – rT3 TestingCasper63,962Reverse T3 Test – rT3 TestingGillette33,047Reverse T3 Test – rT3 TestingLaramie31,501Reverse T3 Test – rT3 TestingRock Springs23,505Reverse T3 Test – rT3 TestingSheridan18,660Reverse T3 Test – rT3 TestingGreen River11,887Reverse T3 Test – rT3 TestingEvanston11,802Reverse T3 Test – rT3 TestingJackson10,728Reverse T3 Test – rT3 TestingRiverton10,619Reverse T3 Test – rT3 TestingCody10,055Reverse T3 Test – rT3 TestingRawlins8,382Reverse T3 Test – rT3 TestingLander7,551Reverse T3 Test – rT3 TestingPowell6,385Reverse T3 Test – rT3 TestingDouglas6,330Reverse T3 Test – rT3 TestingTorrington6,196Reverse T3 Test – rT3 TestingRanchettes6,179Reverse T3 Test – rT3 TestingWorland4,843Reverse T3 Test – rT3 TestingBuffalo4,389Reverse T3 Test – rT3 TestingSouth Greeley4,385Reverse T3 Test – rT3 TestingFox Farm-College4,321Reverse T3 Test – rT3 TestingMills4,106Reverse T3 Test – rT3 TestingWheatland3,567Reverse T3 Test – rT3 TestingNewcastle3,283Reverse T3 Test – rT3 TestingGlenrock2,914Reverse T3 Test – rT3 TestingBar Nunn2,897Reverse T3 Test – rT3 TestingWarren AFB2,884Reverse T3 Test – rT3 TestingThermopolis2,826Reverse T3 Test – rT3 TestingEvansville2,730Reverse T3 Test – rT3 TestingKemmerer2,632Reverse T3 Test – rT3 TestingNorth Rock Springs2,497Reverse T3 Test – rT3 TestingHoback2,268Reverse T3 Test – rT3 TestingGreybull2,187Reverse T3 Test – rT3 TestingAfton2,181Reverse T3 Test – rT3 TestingLovell2,176Reverse T3 Test – rT3 TestingStar Valley Ranch2,168Reverse T3 Test – rT3 TestingPinedale2,058Reverse T3 Test – rT3 TestingSouth Park1,896Reverse T3 Test – rT3 TestingWright1,754Reverse T3 Test – rT3 TestingLyman1,729Reverse T3 Test – rT3 TestingSaratoga1,693Reverse T3 Test – rT3 TestingArapahoe1,665Reverse T3 Test – rT3 TestingFort Washakie1,647Reverse T3 Test – rT3 TestingLusk1,577Reverse T3 Test – rT3 TestingEthete1,561Reverse T3 Test – rT3 TestingWilson1,407Reverse T3 Test – rT3 TestingSundance1,361Reverse T3 Test – rT3 TestingBasin1,356Reverse T3 Test – rT3 TestingPine Bluffs1,273Reverse T3 Test – rT3 TestingGrover1,269Reverse T3 Test – rT3 TestingRanchester1,211Reverse T3 Test – rT3 TestingMarbleton1,165Reverse T3 Test – rT3 TestingSleepy Hollow1,140Reverse T3 Test – rT3 TestingRafter J Ranch1,139Reverse T3 Test – rT3 TestingMoose Wilson Road1,130Reverse T3 Test – rT3 TestingUpton1,031Reverse T3 Test – rT3 TestingGuernsey1,016Reverse T3 Test – rT3 Testing