New England · Triiodothyronine Hormone T3 Test
Triiodothyronine Hormone T3 Test in New Hampshire
Triiodothyronine Hormone T3 Test is a laboratory test you can request directly. A T3 test measures the amount of triiodothyronine, a thyroid hormone, in your blood. It helps clinicians evaluate how well your thyroid is working.
Lab requirements in New Hampshire
Here is what you need before ordering and completing the Triiodothyronine Hormone T3 Test in NH. Review each item and confirm the details with the collection lab.
- Physician's order
- Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
- Fasting
- Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
- Preparation
- Preparation instructions can vary depending on the laboratory and the specific method used. Always follow the instructions provided by the collection lab or your clinician.
- Sample & visit
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Identification
- Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
- Turnaround
- 1-3 business days
- Availability
- Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.
Before you go
- Order your test before visiting a lab, then use the requisition form in your account.
- Print the requisition form, or fax it to the lab directly from your account.
- No scheduling is needed — visit the collection lab during its normal business hours.
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Bring a government-issued photo ID in case the lab requests it.
- Results are posted to your secure account within 1–3 business days.
Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.
What this test is
The T3 test is a blood test that checks the level of triiodothyronine, both free and bound forms. T3 is one of the main hormones produced by the thyroid gland and affects metabolism, heart rate, and body temperature. This test is often used along with other thyroid tests to get a fuller picture of thyroid function.
What it measures
- Total T3 — reflects the total amount of triiodothyronine in the blood, including both bound and free forms
- Free T3 — reflects the unbound, active portion of triiodothyronine that is available for the body to use
What the test involves
The test requires a standard blood draw from a vein in your arm. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician may order a T3 test if you have symptoms of an overactive or underactive thyroid, such as unexplained weight changes, fatigue, or heart palpitations. It can also be used to monitor treatment for thyroid conditions or to investigate an abnormal result from another thyroid test.
Preparation
Preparation instructions can vary depending on the laboratory and the specific method used. Always follow the instructions provided by the collection lab or your clinician.
How results are reported
Results are typically reported as a numeric value for total T3 or free T3, along with a reference range. Reference ranges differ between laboratories, so your result should be interpreted using the range provided by the testing lab.
Before you go
- Whether fasting is required before the test
- Any medications or supplements that might affect results
- The specific reference range used by the laboratory
Cities
Triiodothyronine Hormone T3 Test in New Hampshire communities
Choose your city for local context and to order this test.