What's this test for?

This test is ideal if you're experiencing unexplained weight changes, fatigue, or mood swings that might be linked to a thyroid problem. It helps figure out how well your thyroid hormones are binding and moving through your bloodstream. It's often used alongside other thyroid tests to get a fuller picture of what's going on.

What happens after I get my results?

Your results will show up in your account with the normal range clearly explained next to your value. Depending on where you land, next steps might include retesting in a few months, adjusting diet or stress levels, or seeking care quickly if a value is extremely out of range. You can download a standard lab report anytime from your account, and the trends feature lets you track this value over time if you retest later.

What's included in this test?

This test measures T3 uptake, a single biomarker that reflects how many binding sites are available for thyroid hormone in your blood. It's useful because certain conditions, medications, and even pregnancy can shift these binding sites without changing your actual thyroid hormone levels. Looking at this alongside thyroxine (T4) gives a clearer view of your true thyroid status.

How can I naturally support thyroid health?

Eating enough iodine-rich foods like seafood and dairy, along with selenium sources like Brazil nuts, can support normal thyroid function. Managing stress through sleep and light exercise helps too, since chronic stress can throw off hormone binding proteins. Avoiding extreme diets and excess soy or processed foods may also help keep things balanced.

When will I get my results?

Results are typically ready within about 7 days of your sample being tested at the lab. You'll get a notification once they're posted to your account. If your results come back unusually fast or slow, that's normal lab variation and nothing to worry about.

Who should consider this test?

Anyone dealing with symptoms like fatigue, weight changes, hair thinning, or mood shifts that could point to a thyroid issue should consider this test. It's also useful if you're pregnant, taking hormone medications, or have a liver condition, since these can all affect the result. People already being monitored for thyroid concerns often use it alongside other thyroid markers.

What symptoms indicate I may need this test?

Common symptoms include feeling unusually tired, gaining or losing weight without trying, feeling too cold or too hot, or noticing changes in your hair or skin. Mood changes like anxiety or depression can also be linked to thyroid hormone imbalances. If these symptoms have been going on for a while, this test can help clarify what's happening.

What does high T3 uptake mean?

A higher than normal result can mean there are fewer binding sites available, which can happen with conditions like an overactive thyroid, certain liver problems, or use of androgens (male hormones). It can also show up during times of physical stress. This result should be looked at together with your T4 level for an accurate picture.

What does low T3 uptake mean?

A lower than normal result often means there are more binding sites available than usual, which can happen during pregnancy, with estrogen use, or with certain protein imbalances in the blood. This doesn't necessarily mean your thyroid itself is underactive. Again, pairing this with your T4 result gives the clearest interpretation.

How often should I retest?

If your result is within the normal range and you feel fine, retesting once a year or as part of a routine check-in is usually enough. If your result was abnormal or you're managing a known thyroid or hormone condition, retesting every 3 to 6 months can help track changes. Always retest sooner if new symptoms show up or your situation changes, like starting a new medication or becoming pregnant.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

T3 Uptake Test - Thyroid Hormone Binding Check

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]

T3 Uptake Test — Thyroid Function Blood Test

T3 Uptake

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

What's this test for?

What's included in this test?

What happens after I get my results?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Find a lab near you

T3 Uptake Test — Thyroid Function Blood Test

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

1,000,000+ blood tests later, here's what our customers say