SIDE BY SIDE

Compare products.

See prices, running costs, specifications and trade-offs side by side. Choose two to four products of the same type.

Change products

Product 1Product 2Product 3 (optional)Product 4 (optional)

Blood test membership

SiPhox Health Membership

Membership with one included panel (Longevity Essentials, Thyroid Focus, Hormone Focus or Heart & Metabolic), self-collected at home with the EasyDraw upper-arm kit

$124US price, checked Oct 13, 2026

At-home upper-arm blood kits for one focused panel, monthly to twice a year

Check price at SiPhox Health Full review →

Our all-round blood-panel pick

Function Membership

Annual membership, $365 first year, charged annually

$365 for the first yearUS price, checked Oct 13, 2026

Twice-yearly lab panel membership with clinician review

Check price at Function Health Full review →

Criterion	SiPhox Health Membership	Function Membership
US price	$124Checked Oct 13, 2026 · Price details in the review	$365 for the first yearChecked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$744 Planning total.	$1,095 Planning total.
Choose if	An adult outside Hawaii and New York who won't visit a lab and wants to retest a focused panel every one to six months.	An adult in one of the 48 states Function serves who wants a broad blood panel twice a year, paid out of pocket, to track over time and discuss with their own clinician.
Main trade-off	Each kit tests one small panel, and SiPhox won't refund a billing period once its kit ships.	It's nonrefundable after 48 hours or once a specimen is collected, the renewal price isn't stated, and imaging, add-on tests and home draws cost extra.
Key specifications	Included panels: One of four at no extra cost: Longevity Essentials, Thyroid Focus, Hormone Focus or Heart & Metabolic. You can switch panels anytime Biomarkers: 25 per test on Longevity Essentials, which SiPhox says can be upgraded to up to 62 Cadence and price: Monthly, quarterly or every 6 months. $124 to start, plus shipping and handling, with no monthly fees Sample collection: EasyDraw kit on the upper arm at home, about 5 minutes with 1:1 live support. Fasting 8–12 hours is strongly recommended Lab and turnaround: Same-day pickup for a CLIA-certified lab (SiPhox also shows a CAP badge). Results in 7–10 days. SiPhox doesn't name the lab Upgrades and add-ons: Ultimate 360 shows as +$125 and the GLP Optimization Panel as +$75, swapped in for an included panel. On Longevity Essentials, CBC is +$45 and IGF-1 is +$70. Adding both costs $100. SiPhox doesn't say whether these charges apply to every kit Eligibility: Adults 18 and older. Not yet offered in Hawaii or New York Payment: HSA/FSA eligible. SiPhox doesn't accept insurance	Lab tests: 160+ a year: 100+ at the annual visit, then 60+ more in a follow-up 3 to 6 months later Sample method: Blood draw at a Quest location (about 35 to 85 mL) Home draw: A licensed specialist can draw blood at your home or office in select areas. Function lists it as an advanced add-on test, with no price shown Imaging: MRI and CT aren't included, but members get member pricing. The FAQ lists the Annual MRI at $999 for members and shows no price for the other scans Preparation: Fast for 8 hours before the test Turnaround: First results typically start arriving within 48 hours of testing. The How it works page says results are ready around 2 weeks after an at-home draw appointment Clinician review: Function says clinicians review every result and flag issues. Results include a clinician's summary and action items Membership terms: Billed annually and auto-renews at the then-current price. You can cancel and rejoin anytime but can't pause. Cancellation generally takes effect at the end of the billing cycle Eligibility: Adults 18+ who aren't currently pregnant, in 48 states (not yet Rhode Island, Hawai'i or Puerto Rico). In New York and New Jersey, some lab fees may be billed to you directly by the lab Insurance and HSA/FSA: Function doesn't bill insurance. It lists the membership as HSA/FSA eligible, subject to your plan, with an itemized receipt in your account for reimbursement
Exact variant	Membership with one included panel (Longevity Essentials, Thyroid Focus, Hormone Focus or Heart & Metabolic), self-collected at home with the EasyDraw upper-arm kit	Annual membership, $365 first year, charged annually
Dimensions	Not stated by the manufacturer. The pages checked don't give the EasyDraw kit's size or weight.	No physical product. It's a lab-testing membership.
Installation	No installation. You collect the sample yourself from your upper arm with the EasyDraw kit. SiPhox says it takes about 5 minutes, with 1:1 live support, and uses no vein draw or fingerprick. The help center strongly recommends fasting 8–12 hours and testing within 30 minutes of waking. Kits ship within 3 days, and samples are picked up the same day for processing at a CLIA-certified lab.	No installation. Function says blood is drawn at one of 2,000+ Quest locations across 48 states. In select areas, a licensed specialist can come to your home or office instead. The How it works page lists this home draw among its advanced add-on tests, with no price shown.
Materials	Not stated by the manufacturer. SiPhox doesn't name the device inside the EasyDraw kit or say how it draws blood.	Not applicable. Function says it tracks your results in one secure place, with a web login and mobile apps.
Warranty	No product warranty. The terms provide the service "as is" and "as available", and cap SiPhox's total liability at $100. SiPhox says it makes commercially reasonable efforts to analyze every biomarker in your panel. If results come back incomplete, it decides whether to send a replacement kit or give credit, and it may give neither. Expired kits can't be registered or replaced.	No warranty. Under the terms of service, Function's services come "as is", with no warranties of any kind. Function also doesn't warrant the accuracy, completeness or timeliness of lab results. The FAQ says the membership isn't a replacement for your health benefits or your doctor.
Returns	SiPhox doesn't refund a billing period once its kit has shipped, and it doesn't take kits back. The refund policy says monthly panel payments are collected at the start of each billing period and aren't refundable. You can cancel under My Account in the portal or through support. To stop a pending shipment, email support before the kit is dispatched. Your benefits run to the end of the paid period, and you can move your next shipment date in the portal.	Under the terms of service, you can cancel for a full refund within 48 hours of your first purchase. That only applies before any specimen is collected or lab testing is done. After that, the membership and renewals are nonrefundable, and the FAQ says Function doesn't refund prior payments. Cancellation generally takes effect at the end of the billing cycle. You can't pause a membership, though the FAQ says you can cancel and rejoin at any time.
Unresolved questions	Whether every kit costs $124, or only the first The shipping and handling charge Biomarker counts for Thyroid Focus, Hormone Focus and Heart & Metabolic Which lab runs the tests, so its CLIA and CAP status can't be checked against CMS or CAP listings What device the EasyDraw kit uses, and whether it's FDA-cleared How upper-arm results compare with standard lab draws, since the FAQ asks "Is the SiPhox at-home test kit equivalent to standard labs?" but shows no answer How long a kit lasts before it expires Whether some kits use a fingerstick, which the Longevity Essentials page also describes	Renewal price after the first year How much the lab bills directly in New York and New Jersey Prices for add-on tests, the home draw and imaging other than the Annual MRI Turnaround for the complete panel Which accreditations, such as CLIA or CAP, the testing labs hold What the expired "Function Day offer" changed

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.