“Function helped save my life.”
HealthEquity members get Function for $364.
Get a deeper look inside your body with 160+ lab tests across your heart, hormones, nutrients, and more. Each result is reviewed by a doctor and translated into plain language, so you know what to do next, not just what’s “normal.”
- Insights from top doctors
- Private AI Chat
- Personalized action plans
Track changes over time. Act sooner.
Function blows my mind. The experience, price, and clinician notes are all phenomenal.
Best money I have spent on healthcare.
Function like Fernando
The deeper issue beneath my fatigue
Function like Aimee
The cancer signals doctors missed
Function like Vieri
The hidden issue inside my “healthy” body
Function like Geoff
Finding prostate cancer after testing
Built with the world's top doctors
Function’s Medical & Scientific Board
Mark Hyman, M.D.
Former Cleveland Clinic physician. Co-founder and chief medical officer of Function.
JoAnn E. Manson, M.D., MPH, DrPH
Chief of Preventive Medicine at Brigham & Women's Hospital. Professor at Harvard.
Andrew Huberman, PhD
Professor of Neurobiology at Stanford School of Medicine.
Toby Cosgrove, M.D.
Former CEO of Cleveland Clinic. Top heart surgeon.
Daniel Sodickson, M.D., PhD
Former chief of innovation in radiology at NYU Langone. Pioneer of AI-driven MRI. Chief medical scientist at Function.
Azra Raza, M.D.
Top medical oncologist. Professor at Columbia University.
Eddie Chang, M.D.
Professor and chair of Neurological Surgery at UCSF.
Luis A. Diaz, M.D.
Head of the Division of Solid Tumor Oncology at Memorial Sloan Kettering Cancer Center.
Yves Michel Duroseau, M.D.
Chair of the Department of Emergency Medicine at Lenox Hill Hospital.
Jordan Shlain, M.D.
Primary care physician. Founder and chairman of Private Medical.
Jen Ashton, M.D., M.S.
Double board-certified in OBGYN and Obesity Medicine; MS in Nutrition.
Mark Hyman, M.D.
Former Cleveland Clinic physician. Co-founder and chief medical officer of Function.
JoAnn E. Manson, M.D., MPH, DrPH
Chief of Preventive Medicine at Brigham & Women's Hospital. Professor at Harvard.
Andrew Huberman, PhD
Professor of Neurobiology at Stanford School of Medicine.
Toby Cosgrove, M.D.
Former CEO of Cleveland Clinic. Top heart surgeon.
Daniel Sodickson, M.D., PhD
Former chief of innovation in radiology at NYU Langone. Pioneer of AI-driven MRI. Chief medical scientist at Function.
Azra Raza, M.D.
Top medical oncologist. Professor at Columbia University.
Eddie Chang, M.D.
Professor and chair of Neurological Surgery at UCSF.
Luis A. Diaz, M.D.
Head of the Division of Solid Tumor Oncology at Memorial Sloan Kettering Cancer Center.
Yves Michel Duroseau, M.D.
Chair of the Department of Emergency Medicine at Lenox Hill Hospital.
Jordan Shlain, M.D.
Primary care physician. Founder and chairman of Private Medical.
Jen Ashton, M.D., M.S.
Double board-certified in OBGYN and Obesity Medicine; MS in Nutrition.
Frequently asked questions
Why 160+ lab tests?
Anything less could miss critical parts of your health. Typical physicals tend to focus on conventional standards—and what insurance will cover. This broader view can give you key insights to take action sooner.
How were Function’s tests selected?
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.
Why do some members need 2 lab visits for the Annual Test?
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.
Which tests are included with a Function membership?
Membership includes 100+ lab tests across every major organ system—selected by the world’s top doctors to monitor for thousands of diseases. And 60+ tests halfway through the year to see what’s changed. Hormones, heart, thyroid, nutrients, metals, metabolism, autoimmunity, liver, and inflammation—what others skip, we don’t. If it impacts your future, we test it. Advanced Add-Ons like Galleri and MRI and CT scans are available for an additional cost.
I feel good. Why test?
Testing now can help you keep feeling your best—and may catch small signals that could turn into bigger problems down the line. For example, heart disease can build for decades. Cancer can be silent until later stages.
Why don't I already get these lab tests from my doctor?
Most doctors wait for symptoms to show up before ordering many of these tests. Function gives you a deeper view now—so you can spot trends, catch changes early, and stay ahead.
How do I download the correct receipt for HSA/FSA reimbursement?
To request HSA/FSA reimbursement, download your Itemized Receipt from your Function account. This receipt includes the details typically required for reimbursement and is available after you've scheduled your lab visit. You must have a date of service on file to access an itemized receipt.
Please note that the Stripe Receipt is only a confirmation of your purchase and is not intended for HSA/FSA reimbursement.
Go to Payment History and select Download Itemized Receipt from the menu next to each payment.