What is a T3 Resin Uptake?

T3 Resin Uptake (T3RU) Test is a blood test that measures the level of proteins that carry thyroid hormones in the blood. This test is used monitor a patient’s thyroid health.

For thyroid health:

  • Levels greater than 37% may indicate hyperthyroidism.
  • Levels lower than 37% may indicate hypothyroidism.

Who should get this test?

This test may be ordered:

  • To monitor a patient’s thyroid function

When will I receive my results?

Once completed, you will receive your results within 3-5 business days in your LabFinder portal.

How do I prepare? Do I need to fast?

No preparation or fasting required. Just bring your LabFinder Order and Insurance Card to your appointment.

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