Quick answer: The function health process step by step has six main stages: create an account and pay the annual membership fee ($499 as of 2026), complete the health history intake, book a draw at a Quest Diagnostics patient service center, fast for 12 hours and go in for the blood draw, wait roughly three to five business days for your results to appear in the app, then read your biomarker data alongside the written clinician commentary Function attaches to each panel. The whole cycle from signup to insights takes one to two weeks for most members.
Step 1: Creating Your Function Health Account
You sign up entirely online at functionhealth.com. There is no phone intake, no referral from a physician required, and no paper forms. The signup flow asks for basic demographics, your email address, and payment. As of mid-2026, the annual membership runs $499 (paid upfront) and covers two full blood draws per year. For a full breakdown of what that price includes and where it sits relative to competitors, see our function health cost guide.
Walking through the Function Health process? See how a 100+ biomarker panel with physician review compares step by step. One at-home Superpower draw checks 100+ biomarkers, physician-reviewed.
A few things people miss at this stage: Function operates in most but not all US states. If your state restricts direct-to-consumer lab ordering (New York, New Jersey, and Rhode Island historically fall into restricted territory), you will see a waitlist screen instead of a checkout. The restriction is a state-level laboratory law issue, not a Function policy choice.
Payment is due before you get access to the onboarding flow. HSA and FSA cards work at checkout because blood testing qualifies as a medical expense under IRS Publication 502. If your card issuer declines the transaction, a standard Visa or Mastercard debit or credit card will work as the backup. Function does not currently accept payment plans or monthly billing. For more detail on Function Health HSA and FSA eligibility, that article covers the exact MCC codes involved.
Step 2: The Health History Intake (Onboarding Quiz)
After checkout, Function walks you through a structured health history questionnaire before you can book your draw. This is not optional and it is not just demographic fluff. The answers feed the clinician commentary engine that annotates your results later.
The intake typically covers:
- Current medications and supplements (statins, thyroid meds, and high-dose biotin all affect specific biomarkers and need to be flagged)
- Chronic conditions or prior diagnoses
- Family history of cardiovascular disease, diabetes, and cancer
- Recent major illness, surgery, or injury (acute-phase inflammation will artificially elevate CRP, white blood cell counts, and ferritin)
- Lifestyle basics: sleep hours, alcohol consumption, exercise frequency, diet pattern
Take this section seriously. A member who reports taking 10 mg of biotin daily and forgets to enter it can get a falsely suppressed TSH result, which looks alarming on paper. The intake is also where you note pregnancy, recent blood transfusions, or active infections so the clinical team can contextualize what they see.
The intake takes about ten to fifteen minutes. You cannot skip sections, but you can save progress and return. Once submitted, you unlock the booking calendar.
Step 3: Booking Your Blood Draw Appointment
Function Health uses Quest Diagnostics patient service centers as its draw network. After completing intake, you select a draw location from a map view filtered to your zip code. Quest has over 2,200 locations nationwide, so most suburban and urban members are within a fifteen-minute drive. Rural members in states like Montana or Wyoming may need to travel farther.
Scheduling is done through Function’s own calendar interface, not the Quest website. You pick a date and time slot, and that reservation is sent to Quest’s system. The booking confirmation comes by email and also lives in your Function dashboard.
A few booking details worth knowing:
- Early morning slots (7 AM to 9 AM) fill fastest because people prefer to knock out the fast overnight and get the draw done before work.
- You can reschedule without penalty up to 24 hours before your appointment through the Function dashboard.
- Walk-ins are not allowed. You must have a confirmed booking. Quest staff will check your name against the appointment system.
- You do not need to bring a paper lab order. Function sends the order electronically to Quest before your appointment. Bring a government-issued photo ID.
If you cannot find a convenient Quest location, contact Function support before assuming you are out of options. Some areas have Quest draw locations inside hospital outpatient centers or retail clinics that do not show on the default map view.
How Fasting Works Before Your Draw
Function requires a 12-hour fast before your blood draw. This is a hard requirement, not a suggestion. The fast affects lipid panel accuracy most critically. A post-meal triglyceride number can be two to three times higher than fasting, and LDL particle calculations that use triglycerides in the equation (Friedewald formula) will be meaningless without a proper fast. Glucose and insulin are also fasting-dependent.
What you can have during the fast:
- Plain water (encouraged, helps hydration for the draw)
- Black coffee with no additives is generally acceptable, but Function’s instructions specify water only to be safe. If you drink coffee, make it plain and early.
- Prescription medications with water, unless your prescribing doctor has said otherwise
What breaks the fast:
- Any food, including “just a bite”
- Cream, milk, or sweeteners in coffee or tea
- Gum (the chewing action and sweeteners trigger insulin response)
- Most supplements, especially fat-soluble vitamins (omega-3, vitamin D, vitamin A)
If you arrive at Quest and admit you ate, the phlebotomist will likely draw anyway and note it in the record. Function’s clinical team will flag the relevant panels as non-fasting and note the limitation. It does not invalidate the entire panel, but it does compromise the lipid and glucose data. Better to reschedule than push through a compromised draw.
Step 4: The Blood Draw Itself
The actual appointment at Quest is brief, usually ten to twenty minutes from check-in to exit. The phlebotomist will pull up your order electronically, verify your identity, and collect the required tubes.
Function’s standard panel requires multiple collection tubes, typically four to eight, depending on exactly what is ordered. Each tube is color-coded for different additives and preservation chemistry. The total blood volume collected is usually in the range of 30 to 60 milliliters, roughly two to four tablespoons. This is safe for healthy adults; donors at a blood drive give 450 milliliters.
Common questions at the draw:
- Will it hurt? A brief stick during needle insertion, then nothing. Most people barely notice.
- What if I have small or hard-to-find veins? Tell the phlebotomist upfront. Experienced techs have techniques for difficult draws. Staying well hydrated helps veins be more visible.
- Do I get any results at the collection site? No. Quest processes the tubes and sends them to the appropriate reference labs. You will not learn anything at the draw site.
- Can someone come with me? Yes, though they typically wait in the lobby. Quest phlebotomy rooms are small.
After the draw you can eat immediately. No post-draw restrictions apply. Most people head straight to breakfast.
Step 5: Lab Processing and Turnaround Time
Function Health tests many biomarkers in-house via Quest but sends certain specialized markers to reference labs (e.g., Cleveland HeartLab for advanced lipid fractionation, specific hormone assays, or micronutrient panels). This is standard practice across the industry and explains why not all results land simultaneously.
Typical turnaround by panel type:
| Panel type | Typical turnaround |
|---|---|
| CBC, metabolic panel, lipids, thyroid | 1 to 2 business days |
| Hormones (testosterone, estradiol, DHEA-S) | 2 to 4 business days |
| Advanced lipids (LDL-P, ApoB, Lp(a)) | 3 to 5 business days |
| Micronutrients, heavy metals | 4 to 7 business days |
| Autoimmune or specialty markers | 5 to 10 business days |
The app notifies you as results come in rather than making you wait for the full panel to complete. You will likely see your CBC and basic metabolic panel within 48 hours of your draw and your heavy metals panel a week later. This rolling release is normal and expected.
If ten business days pass with results still missing, contact Function support. Occasionally a tube is rejected by the lab for hemolysis (the red blood cells broke down in transit, usually from a difficult draw) and needs to be recollected. This is rare but happens.
Step 6: Reading Your Results and Clinician Insights
This is the part that differentiates Function from simply ordering a lab panel yourself. Every result in the Function dashboard comes with one of three designations: normal, optimal, or out of range. These are not the same as Quest’s standard reference range flags.
Function uses tighter “optimal” ranges derived from longevity and preventive medicine literature, not just the statistical normal range of a reference population. For example, the standard Quest reference range for fasting glucose might be 70 to 99 mg/dL; Function may flag values above 90 as sub-optimal based on data connecting higher-normal fasting glucose to long-term metabolic risk. This is a deliberate clinical philosophy, not an error.
Each panel section includes written clinician commentary explaining what the values mean in plain language, what might be driving an abnormal result, and what you should discuss with a doctor. This commentary is not personalized one-on-one advice (it is generated by a clinical team reviewing your results in the context of your intake data), but it is substantially more useful than a bare number with a flag.
The dashboard also shows trend data if you have prior draws, which is where the membership model pays off most. Seeing your ApoB drop 18 points between draw one and draw two after you changed your diet gives you concrete feedback that a single annual checkup never provides. For a deeper look at exactly what the panel covers, our function health 100 biomarkers explained article walks through each category.
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 reviewed in full.
How Function Health Compares to Superpower’s Process
Both services follow the same broad arc: sign up, complete intake, book a draw, fast, get drawn at a third-party lab, wait for results, read annotated insights. The differences are in the details and the price point.
| Stage | Function Health | Superpower |
|---|---|---|
| Annual fee | $499 | ~$199 |
| Draws included | 2 per year | 1 per year (second available) |
| Draw network | Quest Diagnostics | Quest Diagnostics |
| Biomarkers (base panel) | ~100 | 100+ |
| Clinician review | Written commentary per panel | Doctor-reviewed results, optional consult |
| App trend tracking | Yes | Yes |
| Intake questionnaire | Yes, required pre-booking | Yes, required pre-booking |
| State availability | Most states, some restrictions | Most states, some restrictions |
For members focused on pure biomarker breadth at the lowest annual cost, Superpower’s pricing gives you comparable depth at less than half the Function fee. For members who want two draws per year built into the base price (useful for people actively intervening on a biomarker), Function’s model may justify the premium. Read the full superpower blood test review and our function health review side by side if you are still deciding.
What People Get Wrong About the Function Health Process
Several misconceptions circulate in Reddit threads and online reviews that are worth correcting directly.
“Function sends a nurse or phlebotomist to my home.” It does not. You go to a Quest location. In-home draws are not part of the standard process and are not currently offered at the base membership tier.
“I need a doctor’s order to participate.” You do not. Function acts as the ordering provider under physician oversight. This is the entire point of the direct-to-consumer model.
“My results will be sent to my primary care doctor automatically.” They will not unless you explicitly share them. Function is a separate platform. Your GP does not see your results unless you download the PDF and bring it in or give Function permission to share. This can be both a privacy feature and a coordination gap depending on your situation.
“The process takes months.” It does not. From account creation to receiving your first results, the median timeline is about ten to fourteen days. The only bottleneck is how quickly you complete intake and book, and how far out Quest’s schedule is in your area.
“Out-of-range results trigger automatic follow-up calls.” Only for critical values. If your potassium is dangerously high or your hemoglobin is at a level suggesting an acute problem, Function’s clinical team will reach out. For garden-variety sub-optimal results (slightly elevated LDL, low vitamin D), the commentary in the app is the follow-up. You initiate further action by talking to your own clinician or booking an add-on consultation. For details on what happens after you see a bad number, the Function Health results accuracy discussion covers how to interpret flags before you panic.
Using the Function Health App Between Draws
The dashboard is not just a results repository. Between draws you can log symptoms, track biomarker trends over time, and review education content tied to specific markers. The app also surfaces recommendations based on your result profile, though these are general lifestyle suggestions rather than personalized prescriptions.
One underused feature: the ability to upload prior lab results from outside Function. If you have Quest or Labcorp results from your doctor’s office, you can upload the PDF and Function will attempt to map them to the same biomarker dashboard. This gives you trend data going back further than your first Function draw, which is genuinely useful for tracking long-term changes in something like HbA1c or thyroid function.
The app is available on iOS and Android and as a web browser dashboard. There is no meaningful feature difference between platforms.
Turn what you just learned into action.
Superpower lets you test 100+ biomarkers from home, then re-check them over time so you can actually see progress, physician-reviewed at every step.
FAQ
How long does the Function Health process take from signup to results?
Most members receive their first results within ten to fourteen days of signing up. The two main variables are how quickly you complete the health intake (it unlocks booking) and how soon you can get a Quest appointment. In dense metro areas Quest slots can be available same-week. In rural areas expect one to two weeks to book. Lab processing adds three to seven business days after the draw.
Can I sign up for Function Health without completing the health history questionnaire?
No. The intake is required before you can access the booking calendar. Function uses your intake responses to personalize the clinician commentary on your results, so it is embedded in the process, not optional. It takes about fifteen minutes and can be paused and resumed.
Do I need to fast before my Function Health blood draw?
Yes, a 12-hour fast is required. Plain water is fine during the fast. Medications can generally be taken with water unless a prescribing doctor has told you otherwise. The fast is most critical for lipid and glucose panels; arriving non-fasting will compromise those specific results even if the rest of your panel is unaffected.
What ID do I bring to my Quest appointment for Function Health?
A government-issued photo ID, meaning a driver’s license, state ID, or passport. You do not need to bring a paper lab order. Function transmits the order to Quest electronically before your appointment. Quest staff will pull it up by name and date of birth.
How does Function Health onboarding differ for first-time members?
First-time members go through the full health history intake, which is more detailed than subsequent annual check-ins. On renewal draws, Function asks only about changes since your last intake (new medications, new diagnoses, significant lifestyle shifts) rather than the full questionnaire again. The booking and draw process is identical for all draws.
What happens if I miss my Function Health appointment?
You can reschedule through the Function dashboard up to 24 hours before. If you no-show without canceling, Quest may mark the slot as a missed appointment in their system. Function generally allows you to rebook without penalty; the membership does not expire if a draw goes unused in a given period, though the membership year does renew on a fixed date. Contact Function support if you have circumstances that prevent you from drawing within the membership year.
Can I see my Function Health results before the full panel is complete?
Yes. Results release on a rolling basis as each lab sub-panel is complete. You will likely see your CBC and basic metabolic panel within 48 hours of the draw, with hormone and specialty panels following over the next week. The app sends a notification each time a new batch of results arrives. You do not need to wait for the entire panel to start reviewing.
Is the Function Health process the same in all states?
The process is identical in states where Function is available, but availability itself varies. New York, New Jersey, and Rhode Island have historically restricted direct-to-consumer lab ordering, so members in those states may encounter a waitlist or be unable to order. If you are unsure about your state, the Function website displays availability at account creation. Our function health andrew huberman piece covers the broader context of why the service has expanded state coverage over time.
How much does the Function Health process cost in total?
The base membership is $499 per year and covers two full draws. There are no lab fees billed separately for the standard panel. Add-on tests (things like continuous glucose monitoring integration, microbiome panels, or additional hormone markers) are priced separately and are optional. For a full price breakdown including add-ons, see our function health cost article. If cost is the primary factor in your decision, also check how much does superpower cost for a direct comparison at a lower price point.
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