Quick answer: To sign up for Function Health, go to functionhealth.com, enter your email to join the waitlist or purchase directly if spots are open, complete a short intake form, and pay the annual membership fee (currently $499/year). Within a few days you receive a lab requisition to book a blood draw at any Quest Diagnostics location near you. Results arrive in the app within about two weeks, each flagged and contextualized by Function’s physician team. There is no ongoing monthly commitment; you pay once per year.
What Is the Function Health Membership, Exactly?
Function Health is a direct-to-consumer lab membership that runs roughly 100 biomarkers in a single annual blood draw, then delivers the results inside a proprietary app with physician-written context for every out-of-range value. The membership is not a subscription in the streaming-service sense: you pay $499/year, you get one comprehensive panel (plus optional add-ons), and the year resets when you renew. There are no copays, no surprise bills from the lab, and no requirement to involve your primary care physician to order or receive the results.
The practical implication: you are buying a pre-negotiated bundle that would cost $800 to $2,000 out of pocket if you tried to order every constituent test separately through a cash-pay lab service. The value proposition is the panel breadth plus the interpretive layer, not just the draw itself. Read our function health review for a deeper look at whether the panel lives up to the price.
How to Sign Up for Function Health: Step by Step
The signup flow has four distinct stages, and knowing each one prevents the frustration most new members report when they hit an unexpected pause.
Step 1: Join the Waitlist or Purchase Directly
Function Health has operated with a waitlist since its launch in 2022, though availability has become more open through 2025 and 2026. Go to functionhealth.com and look for the "Get started" or "Join now" button. If the waitlist is active in your region, you enter your email and receive an invite link within days to a few weeks. If direct enrollment is open, you proceed straight to checkout. Do not pay a third-party site claiming to sell Function invites; the company does not use resellers.
Step 2: Complete the Intake Form
After gaining access, Function asks for basic demographic and health-history information: age, sex, whether you are pregnant or on certain medications that affect reference ranges, and a few questions about your goals (weight, cardiovascular risk, longevity, hormones, and so on). This takes under ten minutes. The data shapes how your results are interpreted and which physician commentary you see, so answer it accurately rather than rushing through.
Step 3: Pay the Annual Membership Fee
As of mid-2026, the standard Function Health membership is $499/year for adults. Founding-member pricing ($499) has been the anchor price for some time. Payment is by credit card; the membership does not auto-enroll in HSA/FSA billing, though some members have successfully reimbursed the cost through their FSA by submitting the itemized receipt as a medical expense. Function does not accept direct insurance payment. For more detail on the cost structure and what is included, see our breakdown of function health cost.
Step 4: Receive and Book Your Lab Requisition
Within one to three business days of payment, Function emails a lab requisition (a PDF or digital order) tied to Quest Diagnostics. You book a Quest appointment online at questdiagnostics.com or by phone, show the requisition (either printed or on your phone), and the draw takes 10 to 20 minutes. You do not pay Quest anything at the time of service; the draw cost is bundled into your membership. Quest has approximately 2,200 patient service centers across the US, so even members in mid-size cities usually find a location within 20 miles.
Step 5: Fast Before Your Draw
Function requires a 12-hour fast for the lipid panel and glucose-related markers. Water, black coffee (no cream, no sugar), and most prescription medications are fine. If you take biotin supplements, stop them 48 hours before the draw; high-dose biotin interferes with thyroid and cardiac assays and can produce falsely normal or falsely abnormal results. Function’s pre-draw instructions cover this, but it is the single most common reason a panel has to be rerun.
Step 6: Wait for Results and Review the App
Turnaround is typically 8 to 14 days after the draw. Results load into the Function Health app (iOS and Android) in batches as different assay panels complete, so you may see thyroid results before hormones or metabolic markers. Each result includes a reference range, a Function-specific "optimal" range that is often tighter than the lab’s standard range, a status flag (optimal, borderline, out of range), and a clinician-written explanation. For a closer look at how the app presents data, our function health app review walks through the interface in detail.
What Does the Function Health Membership Include?
The core membership covers one full panel per year, physician review of flagged values, and 12 months of app access to track your history. The panel spans roughly 100 individual biomarkers organized into categories.
| Category | Examples of Markers Included |
|---|---|
| Metabolic and glucose | Fasting glucose, insulin, HbA1c, HOMA-IR |
| Lipids and cardiovascular | LDL-P, HDL, triglycerides, ApoB, Lp(a), hsCRP |
| Thyroid | TSH, free T3, free T4, reverse T3, thyroid antibodies |
| Hormones | Total and free testosterone, DHEA-S, estradiol, cortisol, SHBG, prolactin |
| Nutrients and vitamins | Vitamin D (25-OH), B12, folate, ferritin, iron panel, zinc, magnesium RBC |
| Organ function | CMP (BMP + liver enzymes + protein), eGFR, uric acid, CBC with differential |
| Inflammation and immune | hsCRP, homocysteine, WBC differential, ESR (some panels) |
| Longevity markers | IGF-1, DHEA-S, telomere length (select tiers) |
Function also sells add-on panels at extra cost: heavy metals, comprehensive genetic risk, advanced cardiovascular imaging referrals, and others. These are optional and billed separately after signup. See the full breakdown of function health add-on test prices if you are weighing the total annual spend.
How Long Does the Function Health Onboarding Take?
From email signup to having results in hand, most members complete the full cycle in three to five weeks. The breakdown: waitlist wait (0 to 14 days, depending on current availability), intake and payment (same day, under an hour), requisition delivery (1 to 3 business days), scheduling and completing the draw (0 to 7 days based on Quest availability in your area), and result processing (8 to 14 days). Members in rural areas with fewer Quest locations sometimes wait longer to book a convenient draw time, which is the most common delay. Function occasionally offers mobile phlebotomy in select metro areas for an additional fee if you cannot reach a Quest easily.
Who Qualifies to Join Function Health?
Function Health is available to US adults 18 and older. There is no income verification, no physician referral needed, and no minimum health status requirement. A few situations complicate enrollment:
- Minors: Function does not currently accept members under 18, even with parental consent. Alternatives for adolescent lab work include the pediatric direct-access options at some commercial labs or a clinician order through their doctor.
- Pregnancy: Function’s reference ranges are calibrated for non-pregnant adults. The company recommends waiting until postpartum before joining, as many hormone and metabolic values shift dramatically during pregnancy and render the "optimal" flags misleading.
- Non-US residents: Membership is currently US-only because it routes through Quest’s domestic network. Canadians or residents of other countries cannot use the service, even with a US mailing address, unless they have a physical presence and can attend a US Quest location.
Does Function Health Require a Referral Code or Invitation?
Historically, Function used an invitation-only system where existing members shared referral links. That has relaxed considerably through 2025 and into 2026. You can typically create an account and purchase directly without a referral. That said, if a friend or physician already has a Function membership, their referral link may unlock a discount (historically $50 to $100 off the first year) and can skip any remaining waitlist delay. It is worth asking if you know someone who is already a member before paying full price.
The simplest way to actually get this done
Superpower is a full-body lab membership that runs 100+ biomarkers, has each result reviewed by a doctor, and tracks your numbers year over year (about $199/year). It is what we point readers to when they would rather get one clean, complete draw than chase single tests one at a time. Here is superpower blood test review reviewed in full.
What Happens After You Sign Up: The First-Year Experience
The joining function health experience does not end at the draw. After results load, Function’s app surfaces a prioritized action list, which typically highlights out-of-range values in descending order of urgency. A member with low vitamin D, borderline insulin resistance, and optimal lipids sees a different set of recommendations than someone with elevated Lp(a) and high cortisol. The app links each finding to an explanatory article and, in some cases, a suggested follow-up test or specialist referral.
What Function does not do: it does not prescribe, it does not manage chronic conditions, and it does not replace your primary care doctor. For any value that concerns you, the right move is to bring the printed results to your clinician and discuss the context. The Function report is a conversation-starter with your doctor, not a treatment plan.
At the end of the membership year, you receive a renewal notice. Renewing keeps your historical data intact and lets you compare year-over-year trends, which is where the real value of annual testing compounds over time. Canceling is straightforward; see how the how to cancel function health membership process works if you decide not to renew.
How Function Health Compares to Other Annual Lab Memberships
Before committing $499 to function health membership, it is worth knowing where it sits relative to the alternatives at a structural level, not just on price.
| Service | Annual Price | Biomarkers | Lab Network | Physician Review |
|---|---|---|---|---|
| Function Health | $499 | ~100 | Quest Diagnostics | Yes (flagged values) |
| Superpower | ~$199 | 100+ | Quest or Labcorp | Yes (all results) |
| Lifeforce | $549 initial + $199/quarter | ~40 core + hormones | LabCorp | Yes (included) |
| Marek Health | Varies by plan ($200 to $600+) | 60 to 100+ | LabCorp | Yes (clinician coaching) |
The $300 price gap between Function and Superpower is the most common reason readers reach out after reading how to sign up for function health and then pause. Both services run comparable panel breadths; the difference is mainly in the app interface, physician-review depth, and brand positioning. Our superpower blood test review covers that comparison directly. If the $499/year price is a friction point, it is also worth checking how much does superpower cost to see whether the math changes your decision.
Common Mistakes When Joining Function Health
A handful of avoidable errors cause the majority of first-year frustrations.
- Not fasting: Eating within 12 hours before the draw skews lipids and glucose materially. A non-fasting LDL is essentially useless for cardiovascular risk stratification, and a high postprandial glucose looks like impaired fasting glucose. If you forget to fast, reschedule rather than draw anyway.
- Taking biotin: Covered above, but worth repeating. Even the biotin in a standard multivitamin can interfere at high-dose assay levels. Stop all biotin-containing supplements 48 hours before the draw.
- Booking a Quest that does not do phlebotomy: Not every Quest Diagnostics location draws blood; some are collection drop-off points only. When booking at questdiagnostics.com, filter for "Patient Service Center" specifically, not just any Quest location.
- Expecting Function to manage your care: The Function Health membership is a data service, not a clinical relationship. If a result looks alarming, you should contact your physician. Function’s in-app physician commentary is informational, not a consultation.
- Assuming HSA/FSA reimbursement is automatic: Function does not process HSA/FSA cards directly at checkout in most cases. You may be able to submit the receipt for reimbursement afterward, but check your plan’s rules first. Some FSA administrators categorize preventive lab memberships as eligible; others do not.
FAQ
How long does it take to sign up for Function Health?
The signup form itself takes under 30 minutes once you have access. From first visit to having a confirmed draw appointment, most members complete everything in under a week. Total time from signup to results in the app is typically three to five weeks, with the lab processing time (8 to 14 days) being the longest fixed step.
Is there a Function Health waitlist in 2026?
Waitlist restrictions have eased significantly. In most US states you can now purchase directly without waiting. Some new markets or capacity-limited windows may still show a waitlist, but the average wait in 2025 and 2026 has been measured in days rather than the weeks-to-months delay that characterized early 2023 signups.
What is included in the Function Health membership fee?
The $499/year fee covers one full annual panel (approximately 100 biomarkers), the lab draw at Quest (no separate phlebotomy charge), physician review of out-of-range results, 12 months of app access, and year-over-year trend tracking. Add-on tests, a second mid-year panel, and mobile phlebotomy are priced separately and are optional.
Can I use my HSA or FSA to pay for Function Health?
Function Health has represented the membership as potentially HSA/FSA eligible as a qualified medical expense. However, eligibility depends on your specific plan administrator’s interpretation. Some members have successfully submitted for reimbursement; others have had claims denied. If HSA/FSA reimbursement matters to you, check with your plan before purchasing, and keep the itemized receipt regardless.
Do I need a doctor’s referral to join Function Health?
No. Function Health is a direct-to-consumer service. You order, pay, and receive results without physician involvement on the ordering side. The model is built specifically for people who want lab data without the friction of getting a doctor to order it. That said, you should share results with a clinician, especially for out-of-range cardiovascular or hormone markers.
What Quest Diagnostics locations can I use for my Function Health draw?
Any Quest Diagnostics Patient Service Center in the US accepts Function Health requisitions. The key is to book at a PSC (the phlebotomy-equipped locations) rather than a drop-off site. Quest has over 2,200 PSCs nationwide; use the location finder at questdiagnostics.com and filter for patient service centers to find the closest one that will actually draw your blood.
Can I sign up for Function Health if I have a chronic condition?
Yes. There is no medical screening that blocks enrollment based on health status. Many Function members join specifically because they have a condition (hypothyroidism, type 2 diabetes, cardiovascular risk) and want closer biomarker tracking than their insurance-covered annual visit provides. Function does not manage or treat chronic conditions, but the panel data can be a useful supplement to your clinician’s monitoring. Talk to your doctor about how to integrate the results into your care plan.
How do I renew or cancel my Function Health membership?
Renewal happens through the account settings in the Function Health app or website. The membership does not auto-renew by default for new members; you receive an email prompt near the end of your year. Canceling before your year ends does not produce a prorated refund under the standard terms. For the step-by-step cancellation process, see our guide on how to cancel function health membership.
