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Territories · Thyroid Blood Testing – Thyroid Level Test

Thyroid Blood Testing – Thyroid Level Test in Puerto Rico

Thyroid Blood Testing – Thyroid Level Test is a laboratory test you can request directly. This blood test measures key thyroid hormones to help assess thyroid function.

Typical turnaround1-3 business days
Price range$39
PreparationFollow the lab's instructions.
Sample typeBlood draw at a collection lab
ReferralNo referral required

What this test is

This test evaluates three important thyroid hormone levels: T3 uptake, T4, and T7. These measurements help provide information about how well your thyroid gland is working.

What it measures

  • T3 Uptake — reflects the amount of thyroid hormone bound to proteins in the blood
  • T4 (Thyroxine) — measures the main thyroid hormone produced by the gland
  • T7 (Free Thyroxine Index) — estimates the amount of active thyroid hormone available to tissues

What the test involves

A healthcare professional will collect a blood sample, typically from a vein in your arm. The sample is then sent to a laboratory for analysis.

Why it is often ordered

Clinicians often order this test to help evaluate symptoms related to an overactive or underactive thyroid. It can also be used to monitor thyroid conditions and treatment effectiveness.

Preparation

Please follow any specific instructions provided by the laboratory regarding preparation for this test. Some labs may ask you to fast before the blood draw.

How results are reported

Your results will indicate the levels of T3 uptake, T4, and T7 found in your blood. Reference ranges, which are the typical values for healthy individuals, vary between laboratories and will be provided with your report.

Before you go

  • Specific preparation instructions
  • Test turnaround time
  • If fasting is required

Cities

Thyroid Blood Testing – Thyroid Level Test in Puerto Rico communities

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

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