Why This Lab Is Important
+
Thyroid function plays a central role in metabolism, energy production, temperature regulation and mood. Because the thyroid helps regulate so many core processes, even subtle dysfunction can contribute to fatigue, brain fog, and shifts in weight and metabolism. The Durable THYROID ESSENTIAL panel provides a foundational look at thyroid hormone activity by measuring TSH, Free T4 and Free T3.*
Dr. Passero uses the Durable THYROID ESSENTIAL panel to assess how well the thyroid is functioning and whether the body has sufficient levels of thyroid hormone to support healthy metabolic function. By measuring both TSH and the active thyroid hormones Free T4 and Free T3, this panel provides a more complete picture of thyroid hormone production and activity than any single marker alone. These markers are essential for identifying patterns of low thyroid function and guiding appropriate next steps when symptoms suggest thyroid dysfunction.*
Dr. Passero recommends the Durable THYROID ESSENTIAL panel for anyone seeking to:*
The Durable THYROID ESSENTIAL panel provides a solid foundation for evaluating thyroid health. For those interested in deeper insight into hormone conversion and autoimmune thyroid activity, we also offer the Durable THYROID PREMIUM PANEL.*
What’s Included in the Durable THYROID ESSENTIAL Panel
This panel tests for the following key markers that influence thyroid health:*
What to Expect After Ordering Your Lab Test
After purchasing a lab test from Durable, you’ll receive an order confirmation right away. Your lab order will be emailed separately within two business days. All lab-related communications—including your lab order, instructions and results notifications—are sent via encrypted, HIPAA-compliant email from labs@livedurable.com. To ensure timely delivery, we recommend adding this address to your contacts and checking your spam or promotions folder.
Lab Locations
We've partnered with LabCorp and Quest Diagnostics for convenient blood draw locations nationwide. Once your lab order is emailed to you, it will designate the most convenient location based on your address. You should contact the lab directly to schedule an appointment, and we recommend having your blood draw performed within 2-4 weeks. If you have any concerns about the selected location, please email labs@livedurable.com to explore alternative options.
Timing of Results
Once your blood draw is complete, most results are available within one week. You’ll receive an email notification from labs@livedurable.com when your results are ready to review.
How to Interpret Results
All test results include a lab-generated reference range reflecting values commonly seen in a healthy population. Results are flagged only when they fall outside this range as high or low. While these reference ranges provide helpful context, results are best interpreted alongside your health history, symptoms and trends over time and should be reviewed with your healthcare practitioner.
If you are interested in a virtual lab review with Dr. Passero, you may email his office at GetHealthy@DrKevinPassero.com to schedule an appointment.
Dr. Passero uses the Durable THYROID ESSENTIAL panel to assess how well the thyroid is functioning and whether the body has sufficient levels of thyroid hormone to support healthy metabolic function. By measuring both TSH and the active thyroid hormones Free T4 and Free T3, this panel provides a more complete picture of thyroid hormone production and activity than any single marker alone. These markers are essential for identifying patterns of low thyroid function and guiding appropriate next steps when symptoms suggest thyroid dysfunction.*
Dr. Passero recommends the Durable THYROID ESSENTIAL panel for anyone seeking to:*
- Establish a baseline view of thyroid hormone levels
- Better understand if low thyroid function may be playing a role in symptoms such as fatigue, brain fog or weight changes
- Monitor thyroid health in response to diet, lifestyle or supplementation changes over time
The Durable THYROID ESSENTIAL panel provides a solid foundation for evaluating thyroid health. For those interested in deeper insight into hormone conversion and autoimmune thyroid activity, we also offer the Durable THYROID PREMIUM PANEL.*
What’s Included in the Durable THYROID ESSENTIAL Panel
This panel tests for the following key markers that influence thyroid health:*
- TSH (Thyroid Stimulating Hormone)—TSH is the hormone that signals the thyroid to produce T4 and T3. Changes in TSH often serve as the body’s first warning sign that the thyroid might not be functioning optimally. TSH rises when the thyroid is not producing enough hormone and lowers when thyroid hormone production becomes excessive.
- Free T4 (Free Thyroxine)—Free T4 measures the active form of thyroxine, the primary hormone produced by the thyroid. Much of T4 must be converted into T3, the more active hormone used at the cellular level. Measuring Free T4 helps assess overall thyroid hormone production and availability.
- Free T3 (Free Triiodothyronine)—Free T3 measures the active form of thyroid hormone that the body uses to regulate metabolism, energy and many core cellular functions. T3 is produced in smaller amounts by the thyroid and is also converted from T4. Measuring Free T3 helps assess whether the body has enough active thyroid hormone to support normal metabolic function.
What to Expect After Ordering Your Lab Test
After purchasing a lab test from Durable, you’ll receive an order confirmation right away. Your lab order will be emailed separately within two business days. All lab-related communications—including your lab order, instructions and results notifications—are sent via encrypted, HIPAA-compliant email from labs@livedurable.com. To ensure timely delivery, we recommend adding this address to your contacts and checking your spam or promotions folder.
Lab Locations
We've partnered with LabCorp and Quest Diagnostics for convenient blood draw locations nationwide. Once your lab order is emailed to you, it will designate the most convenient location based on your address. You should contact the lab directly to schedule an appointment, and we recommend having your blood draw performed within 2-4 weeks. If you have any concerns about the selected location, please email labs@livedurable.com to explore alternative options.
Timing of Results
Once your blood draw is complete, most results are available within one week. You’ll receive an email notification from labs@livedurable.com when your results are ready to review.
How to Interpret Results
All test results include a lab-generated reference range reflecting values commonly seen in a healthy population. Results are flagged only when they fall outside this range as high or low. While these reference ranges provide helpful context, results are best interpreted alongside your health history, symptoms and trends over time and should be reviewed with your healthcare practitioner.
If you are interested in a virtual lab review with Dr. Passero, you may email his office at GetHealthy@DrKevinPassero.com to schedule an appointment.
Lab-Specific FAQs
+
What does the Durable THYROID ESSENTIAL panel test for?
TSH, Free T4 and Free T3.*
Why consider upgrading to the Durable THYROID PREMIUM panel?
The Durable THYROID ESSENTIAL panel measures core thyroid markers—TSH, Free T3 and Free T4—to provide a foundational view of thyroid function. The Durable THYROID PREMIUM panel builds on this by adding thyroid antibodies and Reverse T3—markers that help evaluate autoimmune activity and hormone conversion patterns, offering a more complete evaluation of thyroid health.*
Do I need to fast before this blood test?
No, the Durable THYROID ESSENTIAL panel does not require fasting prior to testing.*
Are there any medications or supplements I should not take before my test?
If you take thyroid medication, you should wait until after the blood draw to take your daily dose. You may continue taking other prescribed medications unless your healthcare practitioner advises otherwise. Most supplements may be taken as usual prior to testing; however, supplements containing the B vitamin biotin should be discontinued 48-72 hours before thyroid testing, as biotin may interfere with results.*
Will recent diet or alcohol intake affect my results?
No. Short-term dietary choices or alcohol intake do not significantly influence the markers included in this panel.*
How often should I get this test?
Dr. Passero recommends routine monitoring of these markers, with testing every 3-6 months for most adults. Re-testing at the recommended interval allows you and your healthcare practitioner to monitor trends over time, assess how your body is responding to lifestyle or nutritional changes and make informed adjustments. Testing frequency should be individualized based on risk factors, clinical context and your doctor’s recommendations.*
Does insurance cover the cost of my tests?
Lab tests must be paid for in full at checkout using a credit card, a supported payment platform (such as Shop Pay, PayPal, Google Pay or Venmo), or an eligible FSA/HSA debit card. In some cases, health insurance providers may reimburse individuals for lab testing. You can contact your insurance provider directly to determine whether reimbursement is available. Please note that Durable is unable to provide insurance paperwork or assist with claim submission.
Can I get a refund if I choose not to get my lab work?
Yes. You may request a refund within 365 days of purchase, as long as you have not visited the lab and had your blood drawn.
Can I use a coupon when purchasing my lab test?
At this time, promotions and coupons cannot be applied to lab testing. Lab pricing reflects the cost of clinical testing and processing, and discounts are not available for these services. However, you can redeem Durable REWARDS points at checkout, and when you purchase a lab order, you’ll earn additional points.
Is this blood test for adults only?
Durable lab testing is intended for adults 18 years and older. Testing for individuals under 18 is only recommended when directed by a qualified healthcare provider.*
TSH, Free T4 and Free T3.*
Why consider upgrading to the Durable THYROID PREMIUM panel?
The Durable THYROID ESSENTIAL panel measures core thyroid markers—TSH, Free T3 and Free T4—to provide a foundational view of thyroid function. The Durable THYROID PREMIUM panel builds on this by adding thyroid antibodies and Reverse T3—markers that help evaluate autoimmune activity and hormone conversion patterns, offering a more complete evaluation of thyroid health.*
Do I need to fast before this blood test?
No, the Durable THYROID ESSENTIAL panel does not require fasting prior to testing.*
Are there any medications or supplements I should not take before my test?
If you take thyroid medication, you should wait until after the blood draw to take your daily dose. You may continue taking other prescribed medications unless your healthcare practitioner advises otherwise. Most supplements may be taken as usual prior to testing; however, supplements containing the B vitamin biotin should be discontinued 48-72 hours before thyroid testing, as biotin may interfere with results.*
Will recent diet or alcohol intake affect my results?
No. Short-term dietary choices or alcohol intake do not significantly influence the markers included in this panel.*
How often should I get this test?
Dr. Passero recommends routine monitoring of these markers, with testing every 3-6 months for most adults. Re-testing at the recommended interval allows you and your healthcare practitioner to monitor trends over time, assess how your body is responding to lifestyle or nutritional changes and make informed adjustments. Testing frequency should be individualized based on risk factors, clinical context and your doctor’s recommendations.*
Does insurance cover the cost of my tests?
Lab tests must be paid for in full at checkout using a credit card, a supported payment platform (such as Shop Pay, PayPal, Google Pay or Venmo), or an eligible FSA/HSA debit card. In some cases, health insurance providers may reimburse individuals for lab testing. You can contact your insurance provider directly to determine whether reimbursement is available. Please note that Durable is unable to provide insurance paperwork or assist with claim submission.
Can I get a refund if I choose not to get my lab work?
Yes. You may request a refund within 365 days of purchase, as long as you have not visited the lab and had your blood drawn.
Can I use a coupon when purchasing my lab test?
At this time, promotions and coupons cannot be applied to lab testing. Lab pricing reflects the cost of clinical testing and processing, and discounts are not available for these services. However, you can redeem Durable REWARDS points at checkout, and when you purchase a lab order, you’ll earn additional points.
Is this blood test for adults only?
Durable lab testing is intended for adults 18 years and older. Testing for individuals under 18 is only recommended when directed by a qualified healthcare provider.*
Durable THYROID ESSENTIAL Panel®
Dr. Passero recommends this foundational panel to evaluate TSH, Free T4 and Free T3—key hormones that regulate metabolism, energy, weight and temperature—providing a clear snapshot of overall thyroid function and thyroid hormone levels.*
Suggested Frequency: Every 3-6 Months
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Why This Lab Is Important
+
Thyroid function plays a central role in metabolism, energy production, temperature regulation and mood. Because the thyroid helps regulate so many core processes, even subtle dysfunction can contribute to fatigue, brain fog, and shifts in weight and metabolism. The Durable THYROID ESSENTIAL panel provides a foundational look at thyroid hormone activity by measuring TSH, Free T4 and Free T3.*
Dr. Passero uses the Durable THYROID ESSENTIAL panel to assess how well the thyroid is functioning and whether the body has sufficient levels of thyroid hormone to support healthy metabolic function. By measuring both TSH and the active thyroid hormones Free T4 and Free T3, this panel provides a more complete picture of thyroid hormone production and activity than any single marker alone. These markers are essential for identifying patterns of low thyroid function and guiding appropriate next steps when symptoms suggest thyroid dysfunction.*
Dr. Passero recommends the Durable THYROID ESSENTIAL panel for anyone seeking to:*
The Durable THYROID ESSENTIAL panel provides a solid foundation for evaluating thyroid health. For those interested in deeper insight into hormone conversion and autoimmune thyroid activity, we also offer the Durable THYROID PREMIUM PANEL.*
What’s Included in the Durable THYROID ESSENTIAL Panel
This panel tests for the following key markers that influence thyroid health:*
What to Expect After Ordering Your Lab Test
After purchasing a lab test from Durable, you’ll receive an order confirmation right away. Your lab order will be emailed separately within two business days. All lab-related communications—including your lab order, instructions and results notifications—are sent via encrypted, HIPAA-compliant email from labs@livedurable.com. To ensure timely delivery, we recommend adding this address to your contacts and checking your spam or promotions folder.
Lab Locations
We've partnered with LabCorp and Quest Diagnostics for convenient blood draw locations nationwide. Once your lab order is emailed to you, it will designate the most convenient location based on your address. You should contact the lab directly to schedule an appointment, and we recommend having your blood draw performed within 2-4 weeks. If you have any concerns about the selected location, please email labs@livedurable.com to explore alternative options.
Timing of Results
Once your blood draw is complete, most results are available within one week. You’ll receive an email notification from labs@livedurable.com when your results are ready to review.
How to Interpret Results
All test results include a lab-generated reference range reflecting values commonly seen in a healthy population. Results are flagged only when they fall outside this range as high or low. While these reference ranges provide helpful context, results are best interpreted alongside your health history, symptoms and trends over time and should be reviewed with your healthcare practitioner.
If you are interested in a virtual lab review with Dr. Passero, you may email his office at GetHealthy@DrKevinPassero.com to schedule an appointment.
Dr. Passero uses the Durable THYROID ESSENTIAL panel to assess how well the thyroid is functioning and whether the body has sufficient levels of thyroid hormone to support healthy metabolic function. By measuring both TSH and the active thyroid hormones Free T4 and Free T3, this panel provides a more complete picture of thyroid hormone production and activity than any single marker alone. These markers are essential for identifying patterns of low thyroid function and guiding appropriate next steps when symptoms suggest thyroid dysfunction.*
Dr. Passero recommends the Durable THYROID ESSENTIAL panel for anyone seeking to:*
- Establish a baseline view of thyroid hormone levels
- Better understand if low thyroid function may be playing a role in symptoms such as fatigue, brain fog or weight changes
- Monitor thyroid health in response to diet, lifestyle or supplementation changes over time
The Durable THYROID ESSENTIAL panel provides a solid foundation for evaluating thyroid health. For those interested in deeper insight into hormone conversion and autoimmune thyroid activity, we also offer the Durable THYROID PREMIUM PANEL.*
What’s Included in the Durable THYROID ESSENTIAL Panel
This panel tests for the following key markers that influence thyroid health:*
- TSH (Thyroid Stimulating Hormone)—TSH is the hormone that signals the thyroid to produce T4 and T3. Changes in TSH often serve as the body’s first warning sign that the thyroid might not be functioning optimally. TSH rises when the thyroid is not producing enough hormone and lowers when thyroid hormone production becomes excessive.
- Free T4 (Free Thyroxine)—Free T4 measures the active form of thyroxine, the primary hormone produced by the thyroid. Much of T4 must be converted into T3, the more active hormone used at the cellular level. Measuring Free T4 helps assess overall thyroid hormone production and availability.
- Free T3 (Free Triiodothyronine)—Free T3 measures the active form of thyroid hormone that the body uses to regulate metabolism, energy and many core cellular functions. T3 is produced in smaller amounts by the thyroid and is also converted from T4. Measuring Free T3 helps assess whether the body has enough active thyroid hormone to support normal metabolic function.
What to Expect After Ordering Your Lab Test
After purchasing a lab test from Durable, you’ll receive an order confirmation right away. Your lab order will be emailed separately within two business days. All lab-related communications—including your lab order, instructions and results notifications—are sent via encrypted, HIPAA-compliant email from labs@livedurable.com. To ensure timely delivery, we recommend adding this address to your contacts and checking your spam or promotions folder.
Lab Locations
We've partnered with LabCorp and Quest Diagnostics for convenient blood draw locations nationwide. Once your lab order is emailed to you, it will designate the most convenient location based on your address. You should contact the lab directly to schedule an appointment, and we recommend having your blood draw performed within 2-4 weeks. If you have any concerns about the selected location, please email labs@livedurable.com to explore alternative options.
Timing of Results
Once your blood draw is complete, most results are available within one week. You’ll receive an email notification from labs@livedurable.com when your results are ready to review.
How to Interpret Results
All test results include a lab-generated reference range reflecting values commonly seen in a healthy population. Results are flagged only when they fall outside this range as high or low. While these reference ranges provide helpful context, results are best interpreted alongside your health history, symptoms and trends over time and should be reviewed with your healthcare practitioner.
If you are interested in a virtual lab review with Dr. Passero, you may email his office at GetHealthy@DrKevinPassero.com to schedule an appointment.
Lab-Specific FAQs
+
What does the Durable THYROID ESSENTIAL panel test for?
TSH, Free T4 and Free T3.*
Why consider upgrading to the Durable THYROID PREMIUM panel?
The Durable THYROID ESSENTIAL panel measures core thyroid markers—TSH, Free T3 and Free T4—to provide a foundational view of thyroid function. The Durable THYROID PREMIUM panel builds on this by adding thyroid antibodies and Reverse T3—markers that help evaluate autoimmune activity and hormone conversion patterns, offering a more complete evaluation of thyroid health.*
Do I need to fast before this blood test?
No, the Durable THYROID ESSENTIAL panel does not require fasting prior to testing.*
Are there any medications or supplements I should not take before my test?
If you take thyroid medication, you should wait until after the blood draw to take your daily dose. You may continue taking other prescribed medications unless your healthcare practitioner advises otherwise. Most supplements may be taken as usual prior to testing; however, supplements containing the B vitamin biotin should be discontinued 48-72 hours before thyroid testing, as biotin may interfere with results.*
Will recent diet or alcohol intake affect my results?
No. Short-term dietary choices or alcohol intake do not significantly influence the markers included in this panel.*
How often should I get this test?
Dr. Passero recommends routine monitoring of these markers, with testing every 3-6 months for most adults. Re-testing at the recommended interval allows you and your healthcare practitioner to monitor trends over time, assess how your body is responding to lifestyle or nutritional changes and make informed adjustments. Testing frequency should be individualized based on risk factors, clinical context and your doctor’s recommendations.*
Does insurance cover the cost of my tests?
Lab tests must be paid for in full at checkout using a credit card, a supported payment platform (such as Shop Pay, PayPal, Google Pay or Venmo), or an eligible FSA/HSA debit card. In some cases, health insurance providers may reimburse individuals for lab testing. You can contact your insurance provider directly to determine whether reimbursement is available. Please note that Durable is unable to provide insurance paperwork or assist with claim submission.
Can I get a refund if I choose not to get my lab work?
Yes. You may request a refund within 365 days of purchase, as long as you have not visited the lab and had your blood drawn.
Can I use a coupon when purchasing my lab test?
At this time, promotions and coupons cannot be applied to lab testing. Lab pricing reflects the cost of clinical testing and processing, and discounts are not available for these services. However, you can redeem Durable REWARDS points at checkout, and when you purchase a lab order, you’ll earn additional points.
Is this blood test for adults only?
Durable lab testing is intended for adults 18 years and older. Testing for individuals under 18 is only recommended when directed by a qualified healthcare provider.*
TSH, Free T4 and Free T3.*
Why consider upgrading to the Durable THYROID PREMIUM panel?
The Durable THYROID ESSENTIAL panel measures core thyroid markers—TSH, Free T3 and Free T4—to provide a foundational view of thyroid function. The Durable THYROID PREMIUM panel builds on this by adding thyroid antibodies and Reverse T3—markers that help evaluate autoimmune activity and hormone conversion patterns, offering a more complete evaluation of thyroid health.*
Do I need to fast before this blood test?
No, the Durable THYROID ESSENTIAL panel does not require fasting prior to testing.*
Are there any medications or supplements I should not take before my test?
If you take thyroid medication, you should wait until after the blood draw to take your daily dose. You may continue taking other prescribed medications unless your healthcare practitioner advises otherwise. Most supplements may be taken as usual prior to testing; however, supplements containing the B vitamin biotin should be discontinued 48-72 hours before thyroid testing, as biotin may interfere with results.*
Will recent diet or alcohol intake affect my results?
No. Short-term dietary choices or alcohol intake do not significantly influence the markers included in this panel.*
How often should I get this test?
Dr. Passero recommends routine monitoring of these markers, with testing every 3-6 months for most adults. Re-testing at the recommended interval allows you and your healthcare practitioner to monitor trends over time, assess how your body is responding to lifestyle or nutritional changes and make informed adjustments. Testing frequency should be individualized based on risk factors, clinical context and your doctor’s recommendations.*
Does insurance cover the cost of my tests?
Lab tests must be paid for in full at checkout using a credit card, a supported payment platform (such as Shop Pay, PayPal, Google Pay or Venmo), or an eligible FSA/HSA debit card. In some cases, health insurance providers may reimburse individuals for lab testing. You can contact your insurance provider directly to determine whether reimbursement is available. Please note that Durable is unable to provide insurance paperwork or assist with claim submission.
Can I get a refund if I choose not to get my lab work?
Yes. You may request a refund within 365 days of purchase, as long as you have not visited the lab and had your blood drawn.
Can I use a coupon when purchasing my lab test?
At this time, promotions and coupons cannot be applied to lab testing. Lab pricing reflects the cost of clinical testing and processing, and discounts are not available for these services. However, you can redeem Durable REWARDS points at checkout, and when you purchase a lab order, you’ll earn additional points.
Is this blood test for adults only?
Durable lab testing is intended for adults 18 years and older. Testing for individuals under 18 is only recommended when directed by a qualified healthcare provider.*
