LabInformationLab tests, explained

Triiodothyronine Hormone T3 Test in Washington

Triiodothyronine Hormone T3 Test is a laboratory test you can order directly. A T3 test measures the amount of triiodothyronine, a thyroid hormone that helps regulate metabolism, in your blood. It is often ordered when a doctor suspects an overactive thyroid or wants to monitor a known thyroid condition. This page covers the triiodothyronine hormone t3 test for people in Washington, in Pacific, from what it measures to how to arrange a draw.

Sample type
blood
Category
Hormone
Turnaround
1-3 business days
Price
$39
Referral
Not required

A T3 test measures the amount of triiodothyronine, a thyroid hormone that helps regulate metabolism, in your blood. It is often ordered when a doctor suspects an overactive thyroid or wants to monitor a known thyroid condition.

What it measures

  • Total T3 — Measures all T3 in the blood, including T3 attached to proteins.
  • Free T3 — Measures only the unbound T3 that is active and available to body tissues.
  • Reverse T3 — An inactive form of T3; sometimes measured in special cases.

Who it is for

Doctors typically order a T3 test for people with symptoms of an overactive thyroid, such as weight loss or a fast heartbeat, or to follow up on abnormal thyroid test results.

Preparation

No fasting is usually required. Tell your doctor about any medicines or supplements you take, as some can affect T3 levels.

Results and what they mean

Results are reported as numbers with a reference range. Your clinician interprets them along with your symptoms and other thyroid tests. This is general information, not medical advice; only your clinician can diagnose or treat a thyroid condition.

Requesting the Triiodothyronine Hormone T3 Test in Washington

Order online, choose a certified collection site in Washington, and review results through a secure portal. No referral is required, and orders are processed confidentially. With coastal metros, inland towns, and rural counties with very different access to testing, it pays to schedule your collection in advance.

Frequently asked questions

Do I need to fast for a T3 test?

No, fasting is not typically needed unless your doctor orders other tests at the same time.

What can affect my T3 result?

Medicines like birth control pills, steroids, or thyroid medicines can change T3 levels. Pregnancy can also affect results.

Is a T3 test the same as a T4 test?

No. T3 and T4 are different thyroid hormones. Doctors often order both to get a fuller picture.

How long do results take?

Most T3 tests are ready within 1 to 3 business days.

Triiodothyronine Hormone T3 Test by city in Washington

All testing in Washington →   Full Triiodothyronine Hormone T3 Test guide →