Thyroid Tests
Thyroid Tests is a laboratory test you can order directly. Thyroid tests are blood tests that check how well your thyroid gland is working. The thyroid is a small gland in the neck that helps control energy use, heart rate, and body temperature. These tests are often ordered when you have symptoms such as fatigue, weight changes, or a fast or slow heartbeat.
- Sample type
- blood
- Category
- Thyroid
- Turnaround
- 1-3 business days
- Price
- $119
- Referral
- Not required
Thyroid tests are blood tests that check how well your thyroid gland is working. The thyroid is a small gland in the neck that helps control energy use, heart rate, and body temperature. These tests are often ordered when you have symptoms such as fatigue, weight changes, or a fast or slow heartbeat.
What it measures
- TSH (thyroid-stimulating hormone) — A signal from the brain that tells the thyroid to work harder or slow down.
- Free T4 (thyroxine) — The main thyroid hormone available for your body to use.
- Free T3 (triiodothyronine) — The active form of thyroid hormone that affects cells.
- Thyroid antibodies — Proteins that may suggest the immune system is affecting the thyroid.
Who it is for
A doctor or other clinician usually orders thyroid tests based on your symptoms, a physical exam, or another abnormal test result. They may also be ordered to monitor a known thyroid condition or its treatment.
Preparation
Most thyroid tests need no special preparation and can be done at any time of day. If other blood tests are being drawn at the same time, you may be asked to fast; follow the instructions you are given.
Results and what they mean
Results are reported as numbers for each marker, often with a reference range from the lab. A clinician interprets your results together with your symptoms, history, and any other tests. This is general information only and is not medical advice; talk with a qualified clinician about what your results mean for you.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the thyroid tests is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for a thyroid test?
Usually no. Thyroid tests generally do not require fasting unless your clinician orders other tests that do.
How long do results take?
Most thyroid blood test results are ready in 1 to 3 business days, though timing can vary by lab.
Can I take my thyroid medicine before the test?
Ask your clinician. Some people are told to take it as usual, while others are told to wait until after the blood draw.
Are thyroid tests painful?
They use a standard blood draw from a vein, which feels like a brief pinch. Serious problems are uncommon.