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South · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Mississippi

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 Mississippi

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

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

Jackson326,977Reverse T3 Test – rT3 TestingGulfport231,423Reverse T3 Test – rT3 TestingHattiesburg85,086Reverse T3 Test – rT3 TestingSouthaven54,141Reverse T3 Test – rT3 TestingBiloxi49,061Reverse T3 Test – rT3 TestingOlive Branch39,136Reverse T3 Test – rT3 TestingTupelo37,872Reverse T3 Test – rT3 TestingMeridian35,625Reverse T3 Test – rT3 TestingGreenville30,175Reverse T3 Test – rT3 TestingClinton27,830Reverse T3 Test – rT3 TestingMadison27,459Reverse T3 Test – rT3 TestingPearl27,017Reverse T3 Test – rT3 TestingHorn Lake26,623Reverse T3 Test – rT3 TestingOxford25,859Reverse T3 Test – rT3 TestingBrandon24,887Reverse T3 Test – rT3 TestingStarkville24,578Reverse T3 Test – rT3 TestingRidgeland24,330Reverse T3 Test – rT3 TestingColumbus23,858Reverse T3 Test – rT3 TestingPascagoula22,001Reverse T3 Test – rT3 TestingVicksburg21,748Reverse T3 Test – rT3 TestingGautier18,932Reverse T3 Test – rT3 TestingOcean Springs18,275Reverse T3 Test – rT3 TestingLaurel17,375Reverse T3 Test – rT3 TestingHernando16,730Reverse T3 Test – rT3 TestingLong Beach16,654Reverse T3 Test – rT3 TestingClarksdale15,124Reverse T3 Test – rT3 TestingCorinth14,545Reverse T3 Test – rT3 TestingGreenwood14,521Reverse T3 Test – rT3 TestingNatchez14,435Reverse T3 Test – rT3 TestingD'Iberville12,736Reverse T3 Test – rT3 TestingGrenada12,675Reverse T3 Test – rT3 TestingByram12,591Reverse T3 Test – rT3 TestingMcComb12,400Reverse T3 Test – rT3 TestingMoss Point12,282Reverse T3 Test – rT3 TestingBrookhaven11,855Reverse T3 Test – rT3 TestingPicayune11,777Reverse T3 Test – rT3 TestingPetal11,342Reverse T3 Test – rT3 TestingCleveland11,285Reverse T3 Test – rT3 TestingCanton10,955Reverse T3 Test – rT3 TestingYazoo City10,887Reverse T3 Test – rT3 TestingWest Point10,148Reverse T3 Test – rT3 TestingFlowood10,019Reverse T3 Test – rT3 TestingIndianola9,679Reverse T3 Test – rT3 TestingBay St. Louis9,568Reverse T3 Test – rT3 TestingDiamondhead9,417Reverse T3 Test – rT3 TestingGulf Hills8,825Reverse T3 Test – rT3 TestingBooneville8,702Reverse T3 Test – rT3 TestingSenatobia8,075Reverse T3 Test – rT3 TestingSt. Martin7,984Reverse T3 Test – rT3 TestingNew Albany7,657Reverse T3 Test – rT3 TestingBatesville7,404Reverse T3 Test – rT3 TestingKosciusko7,128Reverse T3 Test – rT3 TestingRichland7,126Reverse T3 Test – rT3 TestingPhiladelphia7,107Reverse T3 Test – rT3 TestingWaveland7,063Reverse T3 Test – rT3 TestingHolly Springs6,743Reverse T3 Test – rT3 TestingAmory6,665Reverse T3 Test – rT3 TestingWest Hattiesburg6,447Reverse T3 Test – rT3 TestingGulf Park Estates6,284Reverse T3 Test – rT3 TestingLouisville6,108Reverse T3 Test – rT3 Testing