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Midwest · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Kansas

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 Kansas

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

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

Wichita491,916Reverse T3 Test – rT3 TestingOverland Park195,249Reverse T3 Test – rT3 TestingKansas City155,745Reverse T3 Test – rT3 TestingTopeka146,473Reverse T3 Test – rT3 TestingOlathe140,339Reverse T3 Test – rT3 TestingLawrence94,745Reverse T3 Test – rT3 TestingShawnee67,021Reverse T3 Test – rT3 TestingLenexa56,755Reverse T3 Test – rT3 TestingManhattan54,794Reverse T3 Test – rT3 TestingSalina46,896Reverse T3 Test – rT3 TestingHutchinson40,202Reverse T3 Test – rT3 TestingLeavenworth37,216Reverse T3 Test – rT3 TestingLeawood33,748Reverse T3 Test – rT3 TestingGarden City28,022Reverse T3 Test – rT3 TestingDodge City27,899Reverse T3 Test – rT3 TestingDerby25,365Reverse T3 Test – rT3 TestingEmporia24,220Reverse T3 Test – rT3 TestingGardner23,065Reverse T3 Test – rT3 TestingJunction City23,033Reverse T3 Test – rT3 TestingPrairie Village22,812Reverse T3 Test – rT3 TestingHays20,870Reverse T3 Test – rT3 TestingPittsburg20,667Reverse T3 Test – rT3 TestingLiberal19,340Reverse T3 Test – rT3 TestingNewton18,576Reverse T3 Test – rT3 TestingAndover15,162Reverse T3 Test – rT3 TestingGreat Bend14,864Reverse T3 Test – rT3 TestingMcPherson13,916Reverse T3 Test – rT3 TestingEl Dorado12,855Reverse T3 Test – rT3 TestingOttawa12,592Reverse T3 Test – rT3 TestingArkansas City12,028Reverse T3 Test – rT3 TestingWinfield11,817Reverse T3 Test – rT3 TestingLansing11,321Reverse T3 Test – rT3 TestingMerriam11,110Reverse T3 Test – rT3 TestingHaysville10,887Reverse T3 Test – rT3 TestingAtchison10,773Reverse T3 Test – rT3 TestingMission9,884Reverse T3 Test – rT3 TestingParsons9,652Reverse T3 Test – rT3 TestingAugusta9,299Reverse T3 Test – rT3 TestingCoffeyville9,032Reverse T3 Test – rT3 TestingChanute8,737Reverse T3 Test – rT3 TestingIndependence8,584Reverse T3 Test – rT3 TestingValley Center8,365Reverse T3 Test – rT3 TestingFort Riley8,006Reverse T3 Test – rT3 TestingSpring Hill7,883Reverse T3 Test – rT3 TestingBonner Springs7,858Reverse T3 Test – rT3 TestingPark City7,817Reverse T3 Test – rT3 TestingWellington7,745Reverse T3 Test – rT3 TestingFort Scott7,579Reverse T3 Test – rT3 TestingRoeland Park6,871Reverse T3 Test – rT3 TestingBasehor6,717Reverse T3 Test – rT3 TestingPratt6,618Reverse T3 Test – rT3 TestingAbilene6,507Reverse T3 Test – rT3 TestingEudora6,457Reverse T3 Test – rT3 TestingDe Soto6,160Reverse T3 Test – rT3 TestingUlysses5,812Reverse T3 Test – rT3 TestingPaola5,733Reverse T3 Test – rT3 TestingMulvane5,676Reverse T3 Test – rT3 TestingMaize5,469Reverse T3 Test – rT3 TestingColby5,434Reverse T3 Test – rT3 TestingTonganoxie5,383Reverse T3 Test – rT3 Testing