Function Health

Overview

Function Health is a direct-to-consumer lab-testing membership that makes comprehensive bloodwork accessible without a physician’s order. The enrollment panel covers 100+ lab tests spanning every major organ system; a 60+ test mid-year follow-up panel is included. All samples are drawn at Quest Diagnostics’ 2,000+ patient service centers — the same CLIA-certified, CAP-accredited infrastructure your physician orders from.

Important framing before you read further. At-home (or in this case, Quest-draw) blood panels are screening and longitudinal tracking tools, not diagnostic instruments. An abnormal result on a Function Health dashboard is a signal to discuss with your physician — not a diagnosis, not a treatment decision, and not a substitute for a clinical evaluation. Normal results do not rule out disease. If you are unwell, start with your doctor, not a DTC panel.

The 2026 context: Function filed suit against Superpower in January 2026, alleging that Superpower’s “100+ tests” marketing overstates measured biomarkers by counting calculated ratios. The dispute has sharpened category-wide scrutiny of how biomarker counts are normalized — and it is why our comparisons distinguish measured analytes from derived calculations.

Panel Coverage

Function’s published enrollment panel covers 100+ lab tests across major organ systems: metabolic, thyroid, sex hormones, inflammation markers, cardiovascular lipids, nutrient status, and more. A mid-year follow-up draw covers 60+ tests. Both draws include clinician review and a personalized action plan — a meaningful differentiator from services that treat interpretation as an optional upsell.

Add-on panels (Galleri multi-cancer early detection, APOE genotyping, and others) are available at additional cost beyond the base membership price.

What the dashboard includes: longitudinal biomarker trend charts, clinical reference-range flagging, food and supplement guidance, and exportable PDF reports.

What it does not include: real-time physician access, primary-care management, or diagnosis. The clinician review produces an action plan — it is not an ongoing care relationship.

Lab Partner

Quest Diagnostics — CLIA-certified, CAP-accredited, the largest clinical lab network in the US. Function members book draws at any of 2,000+ Quest patient service centers. This is not a mail-in fingerstick model; it requires an in-person venous draw, which is a more accurate collection method but also the reason the service is not truly “at-home.”

Pricing

The membership runs $365–$499/year based on the YAML data at time of research (April 2026). No monthly billing option is available. The price range reflects promotional pricing at the lower end of the band.

Membership year	Cost (mid-range)
Year 1	$499
Year 2	$499
Year 3	$499
3-year total	$1,497

For reference: InsideTracker Ultimate (~$589/yr, 43 biomarkers at the ultimate tier), Superpower ($468/yr, contested biomarker count). Function’s per-biomarker cost at 100+ measured analytes is competitive within this tier — but the correct comparison is value delivered, not biomarker count alone, since panel breadth only matters if you act on the results with appropriate clinical guidance.

What a Clinician Sign-Off Actually Means

Function includes clinician review in its standard membership — this is the most consequential structural difference from self-service lab services where you receive raw numbers and no interpretation. However, the clinician review is a one-time action plan per draw cycle, not an ongoing care relationship. It does not replace a primary care physician who knows your full medical history, medications, and clinical presentation.

The correct workflow: use Function’s action plan as a structured conversation starter with your own physician. Do not self-treat based on biomarker results, even when a clinician-generated action plan suggests a supplement or diet change. Supplement interactions with medications, organ-system context, and individual health history require a physician who can see the full picture.

Weaknesses Worth Naming

The YAML data surfaces several structural concerns:

• Not truly at-home. The name implies convenience; the reality is an in-person Quest draw. For users without convenient Quest locations, this is a practical friction point.
• Customer-service complaints. Trustpilot feedback includes cancellation and billing-dispute patterns. Read the current Trustpilot page before committing to an annual membership.
• Lock-in with no monthly exit. Annual billing only — if your health priorities shift or the service disappoints, there is no month-to-month trial option.
• Add-on cost creep. The base membership price does not include the high-value tests (Galleri, APOE) that may motivate advanced users most. Factor these into actual cost.

Regulatory Status

Function Health is a CLIA-registered laboratory service. It is not FDA-cleared as a diagnostic device — it operates under the laboratory testing regulatory framework, not the medical device framework. Results are for wellness tracking and should be interpreted by qualified clinicians, not self-diagnosed.

Where It Fits

• Strong fit: Health-conscious adults who want the broadest annual panel with included clinician context, are near a Quest location, and treat the results as data to discuss with their physician — not as a replacement for clinical care.
• Weaker fit: Users who want true at-home collection (consider SiPhox or Tasso fingerstick services), need ongoing physician access (consider Lifeforce or a concierge medicine practice), or are primarily motivated by actionable lifestyle scoring (InsideTracker integrates dietary recommendations more tightly).

Verdict: Conditional

Function Health is among the most comprehensive DTC bloodwork memberships available in 2026, and the inclusion of clinician review makes it more responsible than services that hand users 100+ raw numbers with no interpretation scaffold. The conditional verdict reflects the annual commitment without a monthly exit, in-person draw requirement, and the ceiling that no DTC panel — however broad — can substitute for longitudinal physician care. If you want the widest panel with an included action plan and you understand these results are screening data to bring to your doctor, Function is a defensible choice. If you want a clinical relationship, see a physician.

How We’ll Test This

Hands-on testing is pending. When we run it, we will draw the panel, evaluate the dashboard experience, document the clinician action plan quality, and measure time-to-results at a Quest location. Results will replace the unverified-experience language above. See our methodology.

Changelog

• 2026-06-15: Expanded review — corrected YAML-grounded details (price range $365–$499, clinician review included by default, 100+ enrollment / 60+ follow-up structure, 2,000+ Quest locations, add-on panel cost), added YMYL screening-vs-diagnosis framing, clinician-review-vs-care-relationship distinction, regulatory status, and structured fit guidance. Hands-on testing still pending.
• 2026-04-11: Initial review published. Biomarker count independently verified against published test list.