Other names: T3 REVERSE, LC/MS/MS
Optimal Result:
9.2 - 24.1 ng/dL,
or
141.32 - 370.2 pmol/L.
Reverse T3 is a biologically inactive thyroid hormone; however, it does block the conversion of thyroxine (T4) to triiodothyronine (T3). Higher levels of reverse T3 can decrease the effect of thyroid hormone. While reverse T3 does not act like other thyroid hormones T3 and T4, it may play a role in brain development. Serum reverse T3 levels are helpful in distinguishing between thyroid disease and disease not related to the thyroid gland. Serum reverse T3 is often helpful when total T3, total T4, free T4, and TSH levels provide expected results or further investigation is needed. Because reverse T3 can be altered by illness, it is not useful in hospitalized patients.
Normal Ranges for serum reverse T3:
10-24 ng/dL
---------------
| Condition | TSH | Free T4 | Total T4 | Free T3 | Total T3 | Reverse T3 (rT3) | Key Notes |
|---|---|---|---|---|---|---|---|
| Primary Hypothyroidism | ↑↑ | ↓ | ↓ | ↓/Nl | ↓/Nl | ↓/Nl | High TSH + low free T4 confirms thyroid gland dysfunction. T3 levels may remain normal initially due to compensatory conversion. |
| Hyperthyroidism | ↓↓ | ↑↑ | ↑↑ | ↑↑ | ↑↑ | ↓/Nl | Suppressed TSH + elevated free T4/T3 indicates overactive thyroid. |
| Subclinical Hypothyroidism | ↑ | Nl | Nl | Nl | Nl | Nl | Mild TSH elevation with normal T4/T3 suggests early thyroid failure. |
| Subclinical Hyperthyroidism | ↓ | Nl | Nl | Nl | Nl | Nl | Low TSH with normal T4/T3 may precede overt hyperthyroidism. |
| Non-Thyroidal Illness (Sick Euthyroid) | Nl/↓ | Nl | Nl/↓ | ↓ | ↓ | ↑↑ | Elevated rT3 and low T3 reflect impaired T4-to-T3 conversion during stress/illness. TSH and free T4 often normal. |
| Central Hypothyroidism | ↓/Nl | ↓ | ↓ | ↓ | ↓ | ↓/Nl | Low/normal TSH + low free T4 indicates pituitary or hypothalamic dysfunction. |
| T3 Toxicosis | ↓↓ | Nl | Nl | ↑↑ | ↑↑ | Nl | Elevated T3 with normal T4 suggests thyroid nodules overproducing T3. |
| Medication Effects (e.g., levothyroxine) | ↓/Nl | Nl/↑ | ↑ | Nl | Nl | Nl | Exogenous T4 raises total T4; free T4 and TSH normalize with proper dosing. |
rT3 Utility:
Elevated rT3 with low T3 is a hallmark of non-thyroidal illness (e.g., stress, malnutrition) and helps distinguish it from true hypothyroidism.
rT3 competes with T3 at cellular receptors, exacerbating symptoms of low thyroid activity in chronic illness.
Testing Guidelines:
TSH is the primary screening test; free T4 and T3 are added for abnormal results.
rT3 is not routinely recommended but may clarify ambiguous cases (e.g., euthyroid symptoms).
Autoimmune Considerations:
Anti-TPO antibodies aid in diagnosing Hashimoto’s or Graves’ disease when TSH/T4 results are equivocal.
For complex cases, always correlate lab results with clinical symptoms and consider repeat testing or specialist referral.
Understanding Elevated Reverse T3 (rT3) Levels
Elevated reverse T3 (rT3) levels often indicate an underlying health condition or metabolic stress. Here are the key points to understand about elevated rT3:
Causes of Elevated rT3
Physiological Role
Elevated rT3 is thought to be a protective mechanism by the body to reduce metabolic rate and conserve energy during times of severe stress or illness. The conversion of T4 to rT3, instead of the active T3 hormone, helps prevent excessive thyroid hormone activity.
Associated Conditions
Diagnosis
Elevated rT3 levels are diagnosed through blood tests that measure thyroid hormones, including T3, T4, TSH, and rT3. A low T3/rT3 ratio (<10) is indicative of the condition.
Treatment Considerations
Summary
Elevated rT3 is often a marker of metabolic stress rather than a direct cause of symptoms. Proper diagnosis and treatment involve identifying and managing the root cause to restore thyroid hormone balance and overall well-being. Understanding the causes, physiological role, associated conditions, and treatment options can help in effectively managing elevated rT3 levels.
Import lab results from multiple providers, track changes over time, customize your reference ranges, and get clear explanations for each result. Everything is stored securely, exportable in one organized file, and shareable with your doctor—or anyone you choose.
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A low Reverse T3 (rT3) serum level may indicate a disruption in the body's thyroid hormone metabolism. Reverse T3 is an inactive form of the thyroid hormone thyroxine (T4) and is produced when T4 is converted to rT3 instead of the active form of T3 (triiodothyronine). This conversion primarily occurs in the liver and kidneys and is influenced by various factors, including stress, illness, and nutritional status.
When the body is under stress or in a state of illness, it may produce more rT3 as a protective mechanism to slow down metabolism, conserving energy. A low rT3 level suggests that the body is not in this "protective" metabolic state and may indicate an imbalance in thyroid hormone conversion. This can sometimes be seen in conditions like hypothyroidism, chronic stress, or overactive adrenal glands, and might contribute to symptoms such as fatigue, weight gain, and low energy.
In clinical practice, evaluating the balance between T3, T4, and rT3 can help doctors assess thyroid function and overall metabolic health. A low rT3 level, in combination with other thyroid markers, can provide valuable insight into whether the thyroid is functioning optimally or if there may be underlying issues affecting hormone conversion. However, it is important to interpret this marker in the context of other lab results and clinical symptoms.
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Import Lab Results from Any Source
Easily upload lab results from any provider, whether it's a hospital, independent lab, or home testing service. We support PDFs, scanned documents, and JPEGs from patient portals. No need to log in to multiple platforms — everything is centralized in one secure space.
Easily upload lab results from any provider — we support PDFs, scans, and images. Keep all your reports organized in one secure place.
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Every lab result is automatically organized on a chronological timeline, giving you a complete picture of your health journey. Whether you're tracking a condition, managing treatments, or staying proactive, the timeline helps you and your doctor understand how things progress over time.
Every lab result is automatically organized on a chronological timeline, giving you a complete picture of your health journey.
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Whether it's a blood test, GI panel, urinalysis, or something else, lab reports measure numerous biomarkers that reveal what's happening inside your body. Our extensive database covers over 10,000 biomarkers, providing clear, simple explanations of what each result means and how you can take action—no matter your membership level. Say goodbye to confusion and get the insights you need to better understand your health.
Our database covers over 10,000 biomarkers with clear, simple explanations—so you can finally understand your results and what to do next.
Enter Your Lab Reports Yourself — Always Free
Enter Your Lab Reports — Always Free
If you'd like to handle inputting your health data into your account, you can do so with our easy-to-use data entry forms. Our user-friendly form is designed to guide you through the quick and easy submission process, making it simple to keep track of your health metrics. This is available to both Complete plan and Unlimited plan members.
Our user-friendly form guides you through a quick, simple submission process, making it easy to enter your health metrics.
Add your results anytime with our easy entry form. It's quick, guided, and helps you stay organized — free for all members.
Visualize Your Results
View your lab data through easy-to-read graphs and tables. Quickly spot patterns, track changes, and compare results across different dates — all without digging through multiple reports. You can also select and compare graphs of specific biomarkers side-by-side to better understand how they relate and change over time.
See your lab reports in clear graphs and tables. Spot patterns, track changes, and compare results over time — all in one place.
Export Your Complete Lab History in a Single File
Export Your Complete Lab History
After collecting lab results from different providers, you can download your entire history combined into a single file. Choose from PDF, Excel, or CSV formats to easily review, share, or get a second opinion—no more juggling multiple reports.
After collecting lab results from different providers, you can download your entire history combined into a single file.
Comprehensive Data Entry Service for Your Reports
Data Entry Service for Your Reports
Our inclusive service handles the data entry for your lab reports. Just submit your information and we'll take care of the rest. Complete plan members receive one report entered for free, then $15 per report after that. Unlimited plan members receive ten report entries for free, then $15 per report after that.
Our inclusive service handles the data entry for your lab reports. Just submit your information and we'll take care of the rest.
Securely Share With Anyone You Trust
Whether you're working with a doctor, nutritionist, caregiver, or wellness coach, you can securely share your complete lab history by sending an invite link to anyone you trust. You have full control over who sees your information and for how long, ensuring your privacy and peace of mind at every step.
Share your full lab history with your doctor, nutritionist, or coach using a secure invite link.
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I have been using Healthmatters.io since 2021. I travel all over the world and use different doctors and health facilities. This site has allowed me to consolidate all my various test results over 14 years in one place. And every doctor that I show this to has been impressed. Because with any health professional I talk to, I can pull up historical results in seconds. It is invaluable. Even going back to the same doctor, they usually do not have the historical results from their facility in a graph format. That has been very helpful.
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As a PRO member and medical practitioner, Healthmatters.io has been an invaluable tool for tracking my clients' data. The layout is intuitive, making it easy to monitor trends and spot patterns over time. The ability to customize reports and charts helps me present information clearly to my clients, improving communication and outcomes. It's streamlined my workflow, saving me time and providing insights at a glance. Highly recommended for any practitioner looking for a comprehensive and user-friendly solution to track patient labs!
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Healthmatters is a personal health dashboard that helps you organize and understand your lab results. It collects and displays your medical test data from any lab in one secure, easy-to-use platform.
With a Healthmatters account, you can:
Professionals can also analyze client data more efficiently and save time managing lab reports.
Healthmatters.io personal account provides in-depth research on 4000+ biomarkers, including information and suggestions for test panels such as, but not limited to:
You can combine all test reports inside your Healthmatters account and keep them in one place. It gives you an excellent overview of all your health data. Once you retest, you can add new results and compare them.
If you are still determining whether Healthmatters support your lab results, the rule is that if you can test it, you can upload it to Healthmatters.
While we work with many popular labs, we welcome reports from lots of other places too.
It's as simple as this: if you can get a test done, you can upload it to Healthmatters and we can interpret results from any lab out there. If laboratories can analyze it, we can interpret it.
If you're on the hunt for a specific biomarker, contact us and we'll add it to our database. Anything from blood, urine, saliva, or stool can be uploaded, understood, and tracked with your Healthmatters account.
The Complete Plan ($15/month) is perfect for individuals who want ongoing access to their health data. It includes unlimited lab imports, visual tracking, custom ranges, result explanations, full account exports, and secure sharing — all with a simple monthly subscription. You can cancel anytime and restart your plan whenever you're ready — your data will still be there waiting for you. You can also upgrade to the Unlimited Plan at any time, with the cost prorated based on what you've already paid.
The Unlimited Plan ($250 one-time) is also designed for individuals but offers lifetime access with no ongoing subscription. You'll get all the same features as the Complete Plan, plus a larger initial data entry allowance (10 reports), making it a great choice if you prefer a one-time payment and long-term use without monthly fees.
In short:
There are two ways to add your test reports to your Healthmatters account. One option is to input the data using the data entry forms. The other method is to utilize our "Data entry service."
Our data entry forms offer an easy, fast, and free way for you to input the reports yourself. Self-entry allows you to add an unlimited number of reports at no cost. We make the self-entry process user-friendly, providing dozens of templates that pre-populate the most popular laboratory panels and offering instant feedback on entered values.
For those who prefer assistance, we offer a "Data entry service" to help you input your data. Simply attach an image or file of your lab test results, and a qualified team member from our data entry team will add the results for you.
We support various file types, including PDFs, JPGs, or Excel. This service is particularly useful if you have many reports to upload or if you're too busy to handle the data entry yourself.
Our Data Entry Service is for when you don't want to manually type in your lab results yourself. You simply upload your report (PDF, image, or screenshot), and our trained team enters the information into your Healthmatters account for you — accurately and neatly organized, ready to view in graphs, tables, and timelines.
The $15 per report covers the time and care it takes for a real person to review your file, make sure each result is entered correctly, and double-check for accuracy. This ensures your health data is precise and easy to work with — without you having to spend the time doing it yourself.
Prefer to do it yourself? You can always use our free self-entry tool to add results manually — it just takes a bit more time and attention.
For users on the Complete monthly plan, the first report is entered free of charge, and each additional report incurs a fee of $15.
Unlimited account holders enjoy the entry of ten reports without charge. Subsequent reports are subject to a $15 fee per report.
Additionally, users on the Complete plan can upgrade to a yearly subscription from the account settings. The annual subscription includes a data entry service for five reports.
All professional accounts allow you to import and onboard an unlimited number of clients and their lab results. The distinction between professional plans lies solely in the data entry service.
The Pro Monthly Plus plan is priced at $75 per month and includes a data entry service for five reports each month. Additional reports can be self-entered at no extra cost or, if preferred, you can use our data entry service for an additional fee of $15 per report.
The Pro Monthly plan is priced at $45 per month and does not include a data entry service. Self-entry is free for an unlimited number of reports, and you can opt for the data entry service at a fee of $15 per report.
You also have the option to upgrade to higher monthly or to annual plans, which come with substantial discounts. All upgrades can be done directly from your account.
Simply log in and navigate to your account settings to cancel your subscription. Scroll down to locate the 'Cancel' button at the bottom of the page. Ensure you cancel at least one day before the renewal date to prevent any charges. Once cancellation is requested, the subscription remains active until the conclusion of the current billing cycle.
Our goal has been to make your Healthmatters account as intuitive as possible.
We've crafted multiple ways for you to navigate your data, whether you're glancing at a single report or delving into your historical test reports.
1. Graph View:Dive into a visual journey with our biomarker graphs, showcasing over 40 data points. Combining years of results unveils trends, empowering you to make informed decisions. Our visualization tools make it a breeze to compare and understand changes over time, even if your results are from different labs. A search function and filters simplify the exploration of extensive data, allowing you to focus on what needs attention.
2. All Tests ViewExplore neatly organized reports on a timeline, highlighting crucial details like dates, critical results, and lab/panel names. Each report opens up to reveal in-depth descriptions and additional recommendations for each biomarker. The history of previous results is just a click away, and you can download a comprehensive report for deeper insights. Color-coded and user-friendly, it's designed for easy reading, understanding, and navigation.
3. Table View:For a holistic view of all biomarkers side by side, our table view is your go-to. Results are neatly displayed in a categorized and dated table, ideal for those with an extensive test history. Utilize sorting, filters, and color-coding to enhance your analysis and gain extra insights.
Yes, you can download your information anytime. We offer two easy ways to export your lab data:
This makes it simple to save, back up, or share your health data whenever you need.
Yes, you can print your report. To do so, navigate to "All tests" and open the report you wish to print. You'll find a print button in the right corner of the report. Click on it, and your browser's print window will open. If you prefer to print in a bigger typeface, adjust the scale using the print window settings.
Yes, you can! We highly recommend activating Two-Factor Authentication (2FA) for your account. To do so, please navigate to the "Profile and Security" section of your account, where you will find instructions for activating 2FA.
Yes, you can. When entering values for the biomarker, you will see an "Edit Range" button. Click this button, and you'll have the option to enter a custom range.
A personal account is all about keeping your own lab test results in check. It's just for you and your personal use.
The professional account is designed for health professionals who wish to track and organize their clients' laboratory results.
To learn more about Healthmatters Pro, please refer to the professional page.
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