Thyroid Peroxidase Antibody (TPO)
The main antibody marker for autoimmune thyroid disease, including Hashimoto's and Graves'.
Consider this test if:
- An abnormal TSH or free T4 result needs an autoimmune cause confirmed
- Fatigue, weight change, cold intolerance, hair loss, or brain fog alongside thyroid symptoms
- Family history of Hashimoto's, Graves', or other autoimmune disease
- Planning pregnancy or already pregnant, when antibody status affects monitoring
- Establishing whether subclinical thyroid changes are autoimmune in origin
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
No fasting required, and timing during the day does not affect the result. Antibody levels are stable, so collection can happen at any time.
Video consult with your Care Team
A 1:1 call to discuss your health.
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What this test is for
Thyroid peroxidase antibodies (TPO antibodies) target the enzyme the thyroid uses to make hormone, and they are the most common marker of autoimmune thyroid disease. They are present in 70 to 90 percent of people with chronic (Hashimoto's) thyroiditis and in many cases of Graves' disease, so a positive result points to an autoimmune cause when TSH or free T4 is abnormal. A small percentage of healthy people, more often women and older adults, carry low-level antibodies without thyroid disease, so the result is read alongside thyroid function and symptoms like fatigue, weight change, cold intolerance, hair loss, and brain fog.
This test measures TPO antibodies on their own. If you also want the second autoimmune thyroid antibody, the Thyroid Peroxidase and Thyroglobulin Antibodies Panel adds thyroglobulin antibody, and the Thyroiditis Panel adds TSH and free T4 to show thyroid function at the same time.
- Specimen
- Serum or plasma
- Measures
- Concentration
What you'll learn
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Insights that connect the dots. A clinician reads your whole picture, not one result in isolation, connecting family history, past results, and lifestyle into clear next steps.
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Your personalized action plan. Nutrition, supplements, and training in one clinician-reviewed protocol, updated as your results change.
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Track your trends. Upload results from any lab and see each biomarker trend over time, so you know what is working.
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Never miss a recheck. Mito tells you what is worth retesting and when, then reminds you so nothing slips.
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1 day
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
Everything your health needs,
in one membership
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Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
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Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
Mito Membership
$9 /mo
cancel anytime
Without membership
$0
pay as you go
At-cost pricing on labs, scans, and more
Priority turnaround on your results
On-demand clinician consults when you need guidance
Personalized action plans across supplements, exercise, nutrition, and sleep
AI health coaching to help you act on your results
Year-round medical support, with in-chat clinician escalation
All your health records in one personal vault, with trends and biological age tracking
Early access to new diagnostics and product releases
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost, covering the lab and what it takes to run the service. It is never a profit on the test itself. Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9 per month, and any applicable lab order or draw fee is itemized before you pay.
Where do I get tested?
Choose an available partner lab at checkout. If your cart contains multiple blood tests, Mito helps consolidate the eligible tests at one lab when possible. At-home kits and scans follow the collection or appointment process shown on their product page.
Is this eligible for HSA/FSA?
Yes. Eligible tests can be paid for with an HSA or FSA card at checkout.
When will I get my results?
Your results appear in your Mito dashboard after the laboratory completes processing. A clinician then reviews them before your analysis and personalized action plan are finalized. Timing varies by test, and specialty assays and at-home kits may take longer.
Do I need a doctor's order?
No. Mito provides the laboratory order when one is required, so you do not need to arrange a separate doctor visit before purchasing.
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