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South · Reverse T3 Test – rT3 Testing

Reverse T3 Test – rT3 Testing in Alabama

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 Alabama communities

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

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