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Special instruction: This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to stop biotin consumption at least 72 hours prior to the collection of a sample.

Preparation instructions: None indicated.

Description: A test that measures levels of total T3, a thyroid hormone typically used to evaluate thyroid function in e.g. hypo- or hyperthyroidism or Graves’ Disease.

Turnaround time: Expected turnaround is within one day, although this may vary depending on other tests ordered for the same blood draw, and expected variation with testing.

Also known as:

  • T3, Total
  • Total T3