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Pacific · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in California

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 may be elevated during certain illnesses.

Typical turnaround1-3 business days
Price range$118
PreparationFollow the lab's instructions.
Sample typeBlood draw at a collection lab
ReferralNo referral required

What this test is

Reverse T3 (rT3) is an inactive form of thyroid hormone. This test helps evaluate thyroid function, particularly in situations where other thyroid tests may appear normal.

What it measures

  • Reverse T3 (rT3) — reflects an inactive form of thyroid hormone

What the test involves

This test requires a blood sample, which is typically collected through a standard venipuncture procedure at a laboratory or clinic.

Why it is often ordered

Clinicians may order this test to help assess thyroid hormone metabolism, especially when considering conditions like nonthyroidal illness syndrome. It can provide additional information when evaluating thyroid health in the context of other medical conditions.

Preparation

You will need to follow specific instructions provided by the laboratory regarding preparation for this test. This may include fasting or avoiding certain medications.

How results are reported

Results are typically available within a few business days and will be reported to your clinician. Reference ranges, which indicate what is considered normal, vary between laboratories.

Before you go

  • Fasting requirements
  • Medication restrictions
  • Test turnaround time

Cities

Reverse T3 Test – rT3 Testing in California communities

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

Los Angeles12,121,244Reverse T3 Test – rT3 TestingSan Francisco3,290,197Reverse T3 Test – rT3 TestingSan Diego3,084,174Reverse T3 Test – rT3 TestingRiverside2,022,285Reverse T3 Test – rT3 TestingSacramento1,924,167Reverse T3 Test – rT3 TestingSan Jose1,729,879Reverse T3 Test – rT3 TestingFresno719,558Reverse T3 Test – rT3 TestingConcord640,270Reverse T3 Test – rT3 TestingBakersfield590,845Reverse T3 Test – rT3 TestingMission Viejo588,540Reverse T3 Test – rT3 TestingMurrieta509,526Reverse T3 Test – rT3 TestingLong Beach466,565Reverse T3 Test – rT3 TestingOakland437,548Reverse T3 Test – rT3 TestingStockton406,822Reverse T3 Test – rT3 TestingVictorville389,060Reverse T3 Test – rT3 TestingModesto382,994Reverse T3 Test – rT3 TestingLancaster381,732Reverse T3 Test – rT3 TestingOxnard366,330Reverse T3 Test – rT3 TestingIndio361,831Reverse T3 Test – rT3 TestingAnaheim348,204Reverse T3 Test – rT3 TestingAntioch322,796Reverse T3 Test – rT3 TestingSanta Rosa314,196Reverse T3 Test – rT3 TestingSanta Ana313,818Reverse T3 Test – rT3 TestingIrvine297,868Reverse T3 Test – rT3 TestingSanta Clarita275,230Reverse T3 Test – rT3 TestingChula Vista274,818Reverse T3 Test – rT3 TestingVisalia249,804Reverse T3 Test – rT3 TestingFremont231,502Reverse T3 Test – rT3 TestingSan Bernardino220,821Reverse T3 Test – rT3 TestingThousand Oaks211,045Reverse T3 Test – rT3 TestingMoreno Valley208,371Reverse T3 Test – rT3 TestingFontana208,087Reverse T3 Test – rT3 TestingSalinas199,290Reverse T3 Test – rT3 TestingHuntington Beach198,735Reverse T3 Test – rT3 TestingSanta Barbara198,240Reverse T3 Test – rT3 TestingGlendale196,512Reverse T3 Test – rT3 TestingHemet191,170Reverse T3 Test – rT3 TestingVallejo181,882Reverse T3 Test – rT3 TestingElk Grove175,510Reverse T3 Test – rT3 TestingOntario175,223Reverse T3 Test – rT3 TestingOceanside174,461Reverse T3 Test – rT3 TestingRancho Cucamonga173,946Reverse T3 Test – rT3 TestingGarden Grove172,708Reverse T3 Test – rT3 TestingPalmdale167,987Reverse T3 Test – rT3 TestingSanta Cruz165,933Reverse T3 Test – rT3 TestingHayward162,254Reverse T3 Test – rT3 TestingCorona157,844Reverse T3 Test – rT3 TestingMerced157,617Reverse T3 Test – rT3 TestingSunnyvale155,550Reverse T3 Test – rT3 TestingPomona151,592Reverse T3 Test – rT3 TestingEscondido151,443Reverse T3 Test – rT3 TestingTorrance147,156Reverse T3 Test – rT3 TestingRoseville145,687Reverse T3 Test – rT3 TestingFairfield145,163Reverse T3 Test – rT3 TestingFullerton142,964Reverse T3 Test – rT3 TestingSanta Maria142,230Reverse T3 Test – rT3 TestingOrange139,195Reverse T3 Test – rT3 TestingPasadena138,771Reverse T3 Test – rT3 TestingYuba City129,536Reverse T3 Test – rT3 TestingSanta Clara127,922Reverse T3 Test – rT3 Testing