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Southwest · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Nevada

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 Nevada

Here is what you need before ordering and completing the Reverse T3 Test – rT3 Testing in NV. 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 Nevada communities

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

Las Vegas2,150,373Reverse T3 Test – rT3 TestingReno463,328Reverse T3 Test – rT3 TestingHenderson311,250Reverse T3 Test – rT3 TestingNorth Las Vegas259,638Reverse T3 Test – rT3 TestingEnterprise219,566Reverse T3 Test – rT3 TestingSpring Valley217,441Reverse T3 Test – rT3 TestingSunrise Manor196,411Reverse T3 Test – rT3 TestingParadise189,852Reverse T3 Test – rT3 TestingSparks106,900Reverse T3 Test – rT3 TestingCarson City57,957Reverse T3 Test – rT3 TestingWhitney45,105Reverse T3 Test – rT3 TestingPahrump42,471Reverse T3 Test – rT3 TestingWinchester36,307Reverse T3 Test – rT3 TestingSummerlin South28,861Reverse T3 Test – rT3 TestingSun Valley22,622Reverse T3 Test – rT3 TestingFernley22,343Reverse T3 Test – rT3 TestingElko20,391Reverse T3 Test – rT3 TestingMesquite20,019Reverse T3 Test – rT3 TestingSpanish Springs16,131Reverse T3 Test – rT3 TestingSpring Creek15,176Reverse T3 Test – rT3 TestingDayton15,036Reverse T3 Test – rT3 TestingBoulder City14,868Reverse T3 Test – rT3 TestingGardnerville Ranchos11,761Reverse T3 Test – rT3 TestingCold Springs10,920Reverse T3 Test – rT3 TestingIncline Village9,440Reverse T3 Test – rT3 TestingFallon9,068Reverse T3 Test – rT3 TestingWinnemucca8,325Reverse T3 Test – rT3 TestingLaughlin8,174Reverse T3 Test – rT3 TestingMoapa Valley7,436Reverse T3 Test – rT3 TestingJohnson Lane6,277Reverse T3 Test – rT3 TestingGardnerville6,037Reverse T3 Test – rT3 TestingIndian Hills5,955Reverse T3 Test – rT3 TestingLemmon Valley5,100Reverse T3 Test – rT3 TestingSilver Springs4,684Reverse T3 Test – rT3 TestingWest Wendover4,517Reverse T3 Test – rT3 TestingBattle Mountain4,122Reverse T3 Test – rT3 TestingEly3,983Reverse T3 Test – rT3 TestingNellis AFB3,626Reverse T3 Test – rT3 TestingMinden3,335Reverse T3 Test – rT3 TestingYerington3,093Reverse T3 Test – rT3 TestingWashoe Valley2,800Reverse T3 Test – rT3 TestingHawthorne2,786Reverse T3 Test – rT3 TestingStagecoach2,313Reverse T3 Test – rT3 TestingCarlin2,279Reverse T3 Test – rT3 TestingKingsbury1,981Reverse T3 Test – rT3 TestingTonopah1,895Reverse T3 Test – rT3 TestingLovelock1,747Reverse T3 Test – rT3 TestingSandy Valley1,723Reverse T3 Test – rT3 TestingTopaz Ranch Estates1,654Reverse T3 Test – rT3 TestingRuhenstroth1,511Reverse T3 Test – rT3 TestingAmargosa Valley1,455Reverse T3 Test – rT3 TestingSmith Valley1,454Reverse T3 Test – rT3 TestingEast Valley1,450Reverse T3 Test – rT3 TestingMogul1,421Reverse T3 Test – rT3 TestingPioche1,158Reverse T3 Test – rT3 TestingAlamo1,154Reverse T3 Test – rT3 TestingJackpot1,130Reverse T3 Test – rT3 TestingWells1,105Reverse T3 Test – rT3 TestingVerdi1,094Reverse T3 Test – rT3 TestingPanaca1,038Reverse T3 Test – rT3 Testing