FAQs

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Function helps you finally understand your body and take control. Some members have caught serious risks like cancer. Others gained the clarity to make small changes that had a big impact on their health.

Everyone 18 or older—except those who are currently pregnant. Start testing with Function to see where your health stands—and where it’s headed.

Function was founded in the US and is based in Austin, Texas.

Function is offered in 2,000+ Quest labs across 48 states (but not yet Rhode Island, Hawai'i, or Puerto Rico).

We created Function with a single mission: empower you to live 100 healthy years. That starts by giving you a more complete view of your body through 160+ lab tests, advanced imaging, and insights from top doctors. From heart, hormones, and immunity to early signs of cancers, aneurysms, cysts, fatty liver, and more, Function can help you detect changes before symptoms appear—so you can take action earlier, and feel your best longer. It's time you own your health.

Your body, mind, and healthcare system should function. But corrupted food systems, chronic stress, and outdated practices can push you toward dysfunction. We exist to change that.

We give you insights across your body—heart, hormones, thyroid, nutrients, toxins, inflammation, and more—so you can stay in control.

Most health plans focus on diagnosing and treating problems after symptoms appear. Function gives you visibility before that.

With 160+ lab tests annually—5x more than the average physical—and access to MRIs, you can learn your health baseline and monitor signals across your whole body. It’s not a replacement for your health benefits or doctor. It’s deeper insight you can use alongside your existing care.

After signing up, log in to Function to easily schedule your lab visit at one of over 2,000 Quest locations nationwide at the time that works for you.

We partner with Quest for easily accessible labs (2,000+ locations across the US) and results trusted by the nation’s medical community.

About 15 minutes. That’s it.

At least twice a year. Membership includes 160+ lab tests annually, selected by the world’s top doctors to monitor for signs of thousands of diseases. Start with 100+ tests at your annual visit, and follow up with 60+ tests 3-6 months later to see what’s changed. Hormones, heart, thyroid, nutrients, metals, metabolic health, autoimmunity, liver, and electrolytes—what others skip, we don’t.

You can test any biomarker on-demand anytime for an additional member-only cost.

Many members can complete their Annual Test in a single lab visit. But members with an active menstrual cycle will need 2 separate visits for accurate hormone results. Members in Arizona also require 2 visits because of state processing rules. We will walk you through any details that apply to you during scheduling.

Go to “Get Tests” then select “Schedule Lab Tests.” From there you can purchase Add-Ons or a re-test of any biomarkers.

Yes. You must use your Mid-Year Test before your annual renewal. It includes 60+ biomarkers to track changes over time and doesn’t roll over.

In your account, select the arrow next to the upcoming visit you'd like to reschedule and choose the "Reschedule" option.

Members get access to 160+ lab tests annually, covering heart, hormones, thyroid, liver, and kidneys, as well as potential heavy metal exposures, nutrient levels, inflammation, potential cancer signals, and more. See all that's included here.

Our doctors—including Function’s Chief Medical Officer Mark Hyman, M.D.—hand-picked every test based on the latest science around disease detection and long-term health impact. This broader view can give you key insights to take action sooner, such as identifying elevated ApoB levels that increase cardiovascular risk even when standard cholesterol appears normal, or detecting hormone imbalances (like thyroid or sex hormones) that can affect energy, metabolism, mood, and fertility long before symptoms become obvious.

Function uses medical-grade tests and labs that meet the highest clinical standards.

Yes—you can book Add-On Tests anytime on-demand to dig even deeper into your health. Choose them based on your goals or risk factors. Add-Ons include:

• Extended Heart & Metabolic
• Galleri® Multi-Cancer Test (screen for signals of 50+ cancers types)
• Extended Hormone Health
• Extended Thyroid Health
• Brain Injury & Degeneration Screening
• Extended Vitamins, Minerals, Nutrients
• Extended Immune Regulation

Explore the full list here.

Function gives you access to lab tests that measure key biomarkers tied to metabolic health—including Hemoglobin A1c and Insulin.

Function goes beyond the standard lipid panel and includes advanced biomarkers like Apolipoprotein B, Lipoprotein A, and Lipoprotein Particle Size. These can help you catch red flags early when traditional tests don’t.

Yes. Function includes a detailed set of thyroid biomarkers, including TSH, T3, and T4.

Mercury and lead are included in your membership. You can also access Add-On Tests for arsenic and aluminum.

Yes. Members can add on the Galleri® Multi-Cancer Test, which looks for signals of 50+ cancers before they become symptomatic, and advanced MRIs that screen for signs of cancers of the brain, thyroid, liver, gallbladder, pancreas, spleen, kidneys, adrenal glands, bladder, ovaries, uterus, and prostate.

Function gives you access to an Add-On Test for Apolipoprotein E (ApoE), a biomarker tied to risk of Alzheimer’s.

Yes. Function has Add-On Tests to look for signs of food and environmental allergies.

Yes, you can access testing for chlamydia, herpes, and more through Add-On Tests.

Function tests major fertility hormones such as FSH (follicle-stimulating hormone) and LH (luteinizing hormone) in both men and women. If you have a regular period, you’ll want to test on day 3 of your cycle for the clearest snapshot.

Function gives you fertility-related data—but it doesn’t make clinical calls. Talk to your doctor to interpret the results and decide what to do next.

We’ll still help you test key biomarkers like AMH, TSH, and Free T3/T4. But we don’t run biomarkers that are likely to be skewed—like FSH, LH, and Estradiol—since birth control can interfere with those results.

Some health questions need multiple biomarkers for a more complete picture. That’s why some Add-Ons include grouped biomarkers.

Both illnesses and vaccines can temporarily raise inflammation biomarkers like hs-CRP. For the most accurate read, we recommend waiting at least 2 weeks after vaccination before testing.

Yes—fast for 8 hours before your test. It helps ensure accurate results for key biomarkers. Stay well-hydrated, too. It makes blood draws smoother and improves urinalysis accuracy.

Yes. Morning labs give the most accurate read on hormones like testosterone and cortisol.

No. Never stop taking medications without talking to your doctor first.

Biotin (Vitamin B7) can interfere with hormone and thyroid markers. Some people choose to pause it 72 hours before testing.

Yes—avoid seafood for 48 hours before tests that check for heavy metals like mercury.

About 35-85 mL depending on the person. For comparison, a typical blood donation is around 500 mL. Pro tip: Hydrate well. It makes the draw easier and faster.

No worries, your phlebotomist is trained and experienced. Just let them know if you’ve fainted in the past. Blood draws are generally safe and there is very little risk.

Not at this time. Many biomarkers shift during pregnancy, making the results harder to interpret.

If you are cycle-syncing, you can test after 2 full menstrual cycles postpartum.

As soon as they are available. Typically, your first batch of results start arriving within 48 hours of testing.

Yes. Every result comes with explanations created by top doctors and built on thousands of hours of research—so you’ll actually understand what your numbers mean. You’ll get action items and a clinician’s full summary.

Insights are tailored to your unique results. They’re sourced from a group of the world’s top doctors—including Function’s Chief Medical Officer, Mark Hyman, M.D. All insights are grounded in peer-reviewed scientific studies from trusted sources like the NIH, JAMA, and NEJM.

If any result is critical, a healthcare provider will call you right away.

Yes. Once your results are ready, you can log in and download them as a PDF to share with your healthcare provider.

Great. Upload your results to Function so you can track everything in one place over time.

Your body is always changing—testing twice a year helps you stay ahead. Most labs offer a single snapshot. Function gives you a personal baseline with over 160 tests, so you can track progress and take action as things shift.

Biomarkers are measurable signals in your body—like a hormone, protein, or vital sign—that can reflect shifts in your health even before symptoms show up. For example, elevated Apolipoprotein B levels can be linked to increased heart disease risk. Tracking biomarkers helps you spot changes early, so you can take action sooner.

Yes. Biomarkers shift with your lifestyle, stress, diet, and sleep. Regular testing shows what’s changing—and gives you the power to act on it.

Yes. You can log into Function and connect supported apps to sync your health data—all in one place. Head to “Connected Apps” after logging in to get started.

MRIs can reveal signs of many cancers, evidence of fatty liver, aneurysms, endometriosis, signs of prior stroke, changes in the brain, skeletal issues, and more. CTs can help screen for signs of lung cancer and calcified plaque buildup in the blood vessels of the heart with a calcium score. You may also want to consider a scan because of:

Family history: If certain conditions—like heart disease or cancer—run in your family, imaging can be a proactive tool to help understand and monitor your risk.

Out-of-range lab results: If your lab tests show patterns linked to increased risk, imaging—guided by a healthcare provider—can give you more context.

Past medical history or symptoms: If you have certain medical history or unexplained symptoms, MRI or CT may be the next best option to reveal what’s going on.

MRIs are traditionally expensive and hard to access. Function makes it simple and affordable while maintaining a high standard of care. A board-certified radiologist reviews every MRI. Our Annual MRI looks at your head, neck, abdomen, and pelvis. It can help scan for signs of hundreds of potential conditions, including signs of cancers of the brain, thyroid, liver, gallbladder, pancreas, spleen, kidneys, adrenal glands, bladder, ovaries, uterus, and prostate. The MRI also scans for signs of prior stroke, sinus inflammation, fatty liver, uterine fibroids, and abdominal aortic aneurysm.

No, but your Function membership unlocks member pricing on imaging.

MRIs and CTs are available at 200+ locations across the US, and expanding fast. Search here.

MRI stands for magnetic resonance imaging. An MRI shows detailed pictures of the inside of your body—like your organs, tissues, and bones. It uses a giant magnet along with electromagnetic and radio waves to capture these images—think of it as a super-powerful camera. Our MRIs take as little as 22 minutes and use no harmful radiation. The machines have wider openings than in the past, are fully lit, ventilated, and open at both ends (above your head and below your feet) for greater comfort during the exam. In some cases, you may be able to listen to music to help you relax during the exam. Your technician will see you and be in contact with you at all times during your MRI.

Function recommends an annual MRI. This allows you to monitor for signs of more aggressive cancers (e.g. ovarian and pancreatic cancers) that may not have been present or too small to be detected in previous MRIs, as well as to monitor for overall health.

CT stands for computed tomography. CTs use a series of X-ray images that a computer combines into detailed 3D pictures of your lungs and chest. Our low-dose CTs (LDCTs) do use a small amount of radiation—about 2-3 millisieverts—which is FDA-cleared and generally considered safe and effective. LDCTs expose you to significantly less radiation than a standard CT. The scan takes just a few minutes, and you lie still while holding your breath briefly as images are captured. Your technician will see you and be in contact with you at all times during your scan.

Our CTs are available for people ages 35-85. Annual screening is typically considered for people at higher risk—such as those age 50+ with a history of smoking and no CT in the past 5 years.

If you are unsure about your eligibility, chat with us here.

The Annual MRI takes ~22 minutes and is available to Function members for $999. It is the most affordable, time-efficient way to get an advanced view of your body’s organs and structures. It looks at your head, neck, abdomen, and pelvis. It can help look for hundreds of potential conditions, including cancers of the brain, thyroid, liver, gallbladder, pancreas, spleen, kidneys, adrenal glands, bladder, ovaries, uterus, and prostate. Also looks for signs of prior stroke, sinus inflammation, fatty liver, uterine fibroids, and abdominal aortic aneurysm.

The MRI with Spine takes ~47 minutes and includes everything in the Annual MRI, plus targeted spine coverage to screen for spinal lesions and tumors, herniated discs, cervical spinal stenosis, spondylosis, fractures, scoliosis, arthritis, and other degenerative changes.

The MRI with Skeletal & Neurological Assessment is 2 sessions of about an hour each. It includes everything in the MRI Scan with Spine, plus looks for signs of neurodegeneration in the brain and narrowing in the arteries of the head and neck with magnetic resonance angiogram (MRA), and provides a brain age analysis. It also includes body composition assessment (fat and muscle volume), hip evaluation (labrum, cartilage, and joint health), and knee scans (for meniscus, ACL, and MCL injuries).

The Lungs CT takes ~3 minutes. This single low-dose chest CT can help screen for signs of lung cancer, pulmonary nodules, emphysema, and more.

The Heart CT takes ~5 minutes and is a Gated Coronary Artery Calcium (CAC) scan. "Gated" means the CT images are timed with your heartbeat to avoid blurriness from heart motion and produce clearer, more accurate images. It measures calcium deposits in the coronary arteries to produce a validated Coronary Artery Calcium (CAC) score to help you understand your long-term risk for heart disease.

These tests are complementary. The Galleri test looks for cancer signals (ctDNA, circulating tumor DNA) in your blood. MRIs take an imaging approach to cancer detection to “visualize” potential tumors in the body. Two views, one goal: seeing more, earlier.

Do not eat any food 6 hours before your appointment. (A full stomach can obscure anatomy, affecting the image quality.) Limit fluid intake about 2 hours before to avoid needing to use the restroom during the appointment. For the day before, avoid fried/greasy and gas-producing foods (soda, seltzer, beans, broccoli, cabbage, etc). Contact your doctor regarding any medications. If you have a medication patch, remove it before your appointment for safety.

For members receiving the coronary artery calcium (CAC) score, limit caffeine to keep your heart rate from interfering with results.

Metallic objects can interfere with imaging, so remove them from your body before your appointment.

Results are ready in 7–10 business days and delivered to your account. You'll get an email as soon as they're available.

Our reports make your results easy to understand and include suggestions on any next steps. If there are urgent findings, a healthcare provider will reach out to you and help you get timely and appropriate care depending on the finding.

You can download your report and imaging files to share with your doctor.

Yes. Check with your plan to confirm eligibility. We’ll provide you with a receipt that you can submit to your HSA/FSA plan.

We don’t offer MRI or CT during pregnancy.

You are eligible if you are nursing. If you have concerns, check with your healthcare provider before scheduling.

We want to create a world where everyone can detect cancer at an affordable price and with the best technology. Because of this, we believe in partnering with top imaging centers and radiologists across the country to deliver the best MRIs and CTs possible. When we partner with an imaging facility, we work hard to eliminate paperwork, reduce wait time, negotiate lower prices, and deliver a seamless in-facility experience.

Function membership is one flat price for a deep-level view of your health as it changes. See our pricing here.

No—Function is 100% insurance-free. No deductibles, no co-pays, no surprise bills. Just transparency.

Yes—check with your plan to confirm eligibility. Members receive an itemized receipt to submit for reimbursement.

Function is built to be a lifelong way to manage your health. While we don't allow pauses at this time, you can cancel and rejoin at any time.

Function does not offer refunds for prior payments.

Testing in New York and New Jersey can cost more due to state regulations. We will walk you through any details that apply to you during scheduling.

Message us through our member chat—we’re here to help. While we don’t offer medical advice, Function provides clear explanations for each biomarker, potential reasons behind out-of-range results, and insights to help you take action. Need urgent help during a lab visit? Reply to the text reminders you received before your visit for support.

Start on our website — it's the fastest way to connect. You can also email us: General inquiries: hello@functionhealth.com Billing questions: membership@functionhealth.com

We take privacy extremely seriously. Function uses the latest security tools and internal protocols to protect your data from unauthorized access or disclosure. Learn more on our security page.

Function is SOC 2 Type II-verified and HIPAA-aligned—your health data stays encrypted, protected, and fully in your control.

Only you, our lab partners, clinicians, and essential administrators can access your results. In some cases, results may also be shared with state health authorities to support public health efforts, as required by law.

It lets us share tools or insights tailored to you—no spam, just what matters. We need your permission before using your health data for any marketing. It’s the law and it’s the right thing to do.

You’ll only hear from us occasionally, and only when it’s relevant. That means tools, insights, or product features based on your unique health data—things we genuinely think could help. We don’t do spam.

Yes. Your health data is yours to control, and you can delete it at any time. Note: Deletion is permanent, and we won’t be able to recover the data once it’s gone.

It's easy. Gift Function here.

Anyone ready to take control of their health—or needs a reason to start. A Function membership isn't just thoughtful. It can be a wake-up call, starting point, or vote of confidence for someone you love.

Yes—and it might be the most meaningful gift you give. Health isn’t just personal—it’s something we share with the people we love.

First purchase the membership in their name. Then they’ll set up their account and schedule their lab visit.

Yes, as long as they are 18 or older. It’s a powerful way to help them invest in their future health.

Buy the membership in their name, and they’ll create their account and schedule their lab visit.

If you're an active Function member (and not a licensed healthcare practitioner), you’re in. Questions? Email referals@functionhealth.com.

Log in to your account and click “Refer Friends” to share your link.

The referral program now offers $25 to you for every successful referral (meaning that the person remains a member for 60 days), as well as $25 toward the first year of membership for the person you refer. In the past, members received $100 for successful referrals, but there was no reward for referred members. Want to see the fine print? See Section 20 of our Terms of Service.

No cap. We want everyone to own their health. ‍

Referral fees are paid by direct deposit through our partner, Impact. Add your payment info to get started.

Share your link with anyone you want to join Function—friends, family, your group chat. ‍

Licensed healthcare professionals aren’t eligible for referral fees due to regulations. But you can still share access. Submit your info here and we’ll be in touch.

No—gift purchases aren’t eligible for referral fees.

If you’re passionate about helping people take charge of their health, we’d love to hear from you. Get started.

We make it easy for providers to partner with us and give their patients access to 160+ lab tests. Learn more here.

Function for Work is easy to roll out and built to make a real impact—learn more.

All employees and their dependents 18+ who want a deeper understanding of their health. Whether your team sits, stands, or is always on the move, they need strong bodies to power performance. Function helps them catch changes early, track progress, and stay in control.

Everything you need to bring health ownership to your workforce—simple setup, clear communication, engagement tools, reporting, and access to the most advanced personal health platform.

Membership includes 160+ lab tests annually across their hormones, heart, thyroid, nutrients, metabolic health, and more. This well-rounded set of tests was selected by some of the world's top specialists and medical experts. They start with 100+ tests at their annual visit, and follow up with 60+ tests 3-6 months later to see what’s changed. See the full list of tests.

Most annual screenings cover just 20–30 basics. Function covers 160+ lab tests annually across systems like metabolism, hormones, and heart health to give a deeper view so your employees can track changes and act before symptoms show up.

Every result comes with explanations created by top doctors and built on thousands of hours of research—so your people understand what their numbers mean. If any results fall outside the expected range, the clinician includes notes to help them better understand their results. If any result is critical, a healthcare provider will call them right away.

Function is available in most states through Quest, allowing employees to schedule tests where it’s most convenient.

Yes. Employers can fully or partially fund Function memberships as an employee wellness benefit.

Function uses HIPAA-aligned, SOC 2 Type II certified systems to keep data secure—built to protect sensitive medical information at every step.

You’ll get detailed reports* on enrollment, engagement, test completion, biomarker trends, and overall population health, so you can track impact over time.

*This data is aggregated and de-identified for privacy.