At home thyroid test: what to measure and which kits cover it

The short answer on at-home thyroid tests

If you only want a screening number, a TSH-only test for $49 at Quest is the cheapest start. If you have symptoms or a family history, you want the full set: TSH, free T4, free T3, TPO antibodies and thyroglobulin antibodies. SiPhox Thyroid Focus measures all five, plus ferritin, lipids and liver and kidney markers, from an at-home upper-arm draw for $124 plus $25 shipping. Stop biotin supplements at least two days before any thyroid test.

The full thyroid set, at homeSiPhox Thyroid Focus: TSH, free T4, free T3, TPO and Tg antibodies with 16 more markers. $124 plus $25 shipping.

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Who should take an at-home thyroid test

The American Thyroid Association lists the classic signs of an underactive thyroid: feeling cold, tired, constipated, low or forgetful, and having dry skin. An overactive thyroid tends to cause the opposite: feeling hot, a racing heart, weight loss, anxiety and poor sleep. A thyroid test is reasonable if you have:

• Several of those symptoms for weeks, with no obvious other cause.
• A parent or sibling with thyroid disease; the ATA notes thyroid problems run in families, and autoimmune thyroid disease is more common in women.
• Another autoimmune condition, such as type 1 diabetes or celiac disease.
• Had a baby in the past year, since thyroid problems can start after pregnancy.
• Already been diagnosed and want to track TSH and free T4 between doctor visits.

If you are pregnant or trying to conceive, or you have chest pain, a very fast heartbeat or a lump in your neck, see a doctor rather than using a home test.

The five markers in a full thyroid test

• TSH (thyroid-stimulating hormone) comes from the pituitary. The American Thyroid Association calls it the best initial test: high TSH usually means an underactive thyroid, low TSH an overactive one.
• Free T4 is the unbound main thyroid hormone. With TSH it shows how well the gland is actually working.
• Free T3 is the active hormone. It is most useful for overactive thyroid; the ATA notes it is the last test to become abnormal in an underactive thyroid.
• TPO antibodies point to autoimmune thyroid disease, the most common cause of hypothyroidism in the US (Hashimoto's).
• Thyroglobulin (Tg) antibodies also indicate autoimmunity and can be positive when TPO is not.

The ATA adds that antibodies help find the cause but repeating them over time does not track whether treatment is working. TSH and free T4 do that job.

At-home thyroid tests compared

Prices checked September 29, 2026. Quest's $149 comprehensive panel matches SiPhox on the five thyroid markers and is the cheaper route if you do not mind a lab visit. SiPhox wins if you want to stay home, or want ferritin, cortisol and lipids measured in the same draw.

None of these kits measure reverse T3. If a clinician wants it, it has to be ordered separately.

Per thyroid marker, the $149 options are close: SiPhox, Quest and Everlywell each charge $149, but Everlywell covers four of the five thyroid markers, while SiPhox adds 16 more markers and ratios, including ferritin, cortisol, lipids and liver enzymes (our count from the published panel lists).

What SiPhox Thyroid Focus measures

Thyroid Focus is one of SiPhox's four core panels, included at the standard $124 per test. SiPhox counts 21 biomarkers including ratios:

Two extras are useful for people with thyroid symptoms. Ferritin screens for low iron stores, which can cause fatigue and hair loss that look like thyroid problems. Lipids matter because an underactive thyroid can raise LDL cholesterol. The panel does not include TSH-receptor antibodies, which are used for Graves' disease.

Thyroid Focus

$124 + $25 shipping per test

21 biomarkers per test

A full thyroid workup including both thyroid antibodies, plus core lipids.

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Ultimate 360

$249 + $25 shipping per test

62 biomarkers per test

Everything on the four core panels plus iron studies, B12 and folate, GGT and PSA.

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Most people start here

Longevity Essentials

$124 + $25 shipping per test

31 biomarkers per test

The default panel: heart, metabolic, hormone and inflammation markers in one draw.

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Longevity Essentials and Heart & Metabolic include TSH only, so they work as a yearly screen. If you are on thyroid medication and want to track the full set every few months, switch to Thyroid Focus for those tests.

Biotin and other things that skew thyroid results

• Biotin. High-dose biotin, common in hair, skin and nail supplements, interferes with many lab tests that use biotin chemistry, including hormone tests, according to the FDA. The ATA says biotin can make thyroid tests look abnormal when they are normal and advises stopping it for two days before testing.
• Thyroid medication timing. Ask your prescriber whether to take your dose before or after the draw, and keep it consistent between tests.
• Pregnancy. MedlinePlus notes TSH is often a little low in the first trimester. Pregnancy thyroid testing belongs with your obstetric team.
• Other medicines and illness. Tell your doctor what you take; steroids and some other drugs affect results, and so does recent serious illness.

How to take an at-home thyroid test

1. Stop biotin at least two days before and check any multivitamin label for it.
2. Collect in the morning, at the same time you used last time, so results are comparable.
3. For SiPhox, hydrate (about 16 oz of water), warm up, use the heat pack for 4 minutes, and let the EasyDraw device fill for up to 5 minutes. Our EasyDraw guide has the details.
4. Ship cold the same day from a staffed FedEx location, Monday to Thursday before 4 p.m.

How often to retest

If you are on thyroid hormone, the ATA says your doctor will check your blood 6 to 8 weeks after starting or changing the dose, because that is how long TSH takes to settle. Testing sooner mostly shows the old dose. Once your dose is stable, most people are checked once or twice a year. If you had a normal TSH but positive antibodies, a yearly TSH is a common approach; ask your doctor. SiPhox lets you switch to Thyroid Focus only for the tests where you need it and use another panel the rest of the time.

At-home thyroid test or through your doctor?

If you have symptoms and a doctor you can see soon, start there. A TSH test ordered by your doctor is usually covered by insurance, and a doctor can examine your neck, review your medicines and order an ultrasound if needed. Home testing makes more sense when:

• Your doctor ordered TSH only, and you want free T3 or the antibodies too.
• You are on thyroid medication and want an extra check between visits, for example after a dose change.
• You want to track thyroid markers alongside ferritin, lipids and cortisol without separate lab visits.
• You cannot easily get to a lab, or you avoid venous draws.

Either way, bring the results to your doctor. A home test can prompt a conversation; it cannot replace the exam and history that a thyroid diagnosis needs. For a wider view of what else to check, see our best at-home blood test ranking.

Which thyroid test to choose

Reading your thyroid results

Thyroid reference ranges vary more between labs than most markers, so always read your result against the range printed on your own report. The usual patterns:

A mildly high TSH with a normal free T4 is common, especially with age, and it often returns to normal on a repeat test a few weeks later. That is one reason a single home result should never start or change treatment on its own.

Positive TPO or Tg antibodies with normal TSH mean autoimmunity is present but the gland is still coping; people in this group are usually retested periodically. Any abnormal result should go to your doctor, who can confirm it with a standard test. SiPhox does not include a doctor review. Women can read our at-home blood test for women guide for markers that overlap with thyroid symptoms.

Track your thyroid without a lab visitThyroid Focus is included in the standard SiPhox membership. Switch panels each test. HSA and FSA eligible.

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Frequently asked questions