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Southwest · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in New Mexico

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 New Mexico

Here is what you need before ordering and completing the Reverse T3 Test – rT3 Testing in NM. 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 New Mexico communities

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

Albuquerque765,693Reverse T3 Test – rT3 TestingLas Cruces141,399Reverse T3 Test – rT3 TestingRio Rancho102,403Reverse T3 Test – rT3 TestingSanta Fe99,439Reverse T3 Test – rT3 TestingRoswell48,347Reverse T3 Test – rT3 TestingFarmington46,696Reverse T3 Test – rT3 TestingHobbs39,476Reverse T3 Test – rT3 TestingClovis38,505Reverse T3 Test – rT3 TestingSouth Valley36,583Reverse T3 Test – rT3 TestingCarlsbad31,525Reverse T3 Test – rT3 TestingAlamogordo31,201Reverse T3 Test – rT3 TestingGallup21,901Reverse T3 Test – rT3 TestingLos Lunas17,072Reverse T3 Test – rT3 TestingSunland Park16,488Reverse T3 Test – rT3 TestingDeming14,730Reverse T3 Test – rT3 TestingChaparral14,098Reverse T3 Test – rT3 TestingLos Alamos13,270Reverse T3 Test – rT3 TestingLas Vegas13,247Reverse T3 Test – rT3 TestingArtesia12,637Reverse T3 Test – rT3 TestingNorth Valley12,594Reverse T3 Test – rT3 TestingPortales12,151Reverse T3 Test – rT3 TestingLovington11,505Reverse T3 Test – rT3 TestingEspañola10,492Reverse T3 Test – rT3 TestingSilver City9,694Reverse T3 Test – rT3 TestingGrants9,208Reverse T3 Test – rT3 TestingBernalillo9,049Reverse T3 Test – rT3 TestingAnthony8,748Reverse T3 Test – rT3 TestingSocorro8,553Reverse T3 Test – rT3 TestingCorrales8,488Reverse T3 Test – rT3 TestingShiprock8,452Reverse T3 Test – rT3 TestingRuidoso7,636Reverse T3 Test – rT3 TestingBloomfield7,514Reverse T3 Test – rT3 TestingBelen7,374Reverse T3 Test – rT3 TestingZuni Pueblo7,012Reverse T3 Test – rT3 TestingTaos6,524Reverse T3 Test – rT3 TestingAztec6,283Reverse T3 Test – rT3 TestingNorth Hobbs6,148Reverse T3 Test – rT3 TestingEdgewood6,106Reverse T3 Test – rT3 TestingRaton6,082Reverse T3 Test – rT3 TestingTruth or Consequences6,078Reverse T3 Test – rT3 TestingSanta Teresa6,037Reverse T3 Test – rT3 TestingLos Ranchos de Albuquerque5,904Reverse T3 Test – rT3 TestingWhite Rock5,716Reverse T3 Test – rT3 TestingEldorado at Santa Fe5,419Reverse T3 Test – rT3 TestingTucumcari5,221Reverse T3 Test – rT3 TestingEl Cerro Mission5,103Reverse T3 Test – rT3 TestingCrouch Mesa4,997Reverse T3 Test – rT3 TestingLos Chaves4,938Reverse T3 Test – rT3 TestingRio Communities4,904Reverse T3 Test – rT3 TestingLee Acres4,851Reverse T3 Test – rT3 TestingParadise Hills4,442Reverse T3 Test – rT3 TestingMeadow Lake4,248Reverse T3 Test – rT3 TestingKirtland AFB4,142Reverse T3 Test – rT3 TestingHolloman AFB4,128Reverse T3 Test – rT3 TestingLa Cienega4,110Reverse T3 Test – rT3 TestingBosque Farms4,010Reverse T3 Test – rT3 TestingPlacitas3,863Reverse T3 Test – rT3 TestingPeralta3,392Reverse T3 Test – rT3 TestingChimayo3,208Reverse T3 Test – rT3 TestingVado3,199Reverse T3 Test – rT3 Testing