We did not order a Rythm kit. This review uses Rythm's homepage, FAQ and full biomarker list (read September 29, 2026), its Trustpilot reviews, and an independent review for the cost breakdown. See how we review.
Rythm Health reviews: the verdict
Rythm Health (often searched as Rhythm Health) is a monthly at-home blood test subscription. You collect a small sample from your upper arm with the FDA-cleared Tasso+ device, send it to Rythm's own CLIA-certified, CAP-accredited lab, and get 25+ biomarkers back in about 48 hours once processing starts, signed off by a licensed physician. It costs $79 per test plus shipping and tax, with 25% off the first test ($59.25).
Customers rate it highly: 4.8 out of 5 from about 2,984 Trustpilot reviews. The limits are the panel (no HbA1c or Lp(a)) and the fact that shipping is added on top. We score Rythm 7.5 out of 10, just behind SiPhox Health at 7.6.
Rythm Health price and plans
| Item | Detail (checked September 29, 2026) |
|---|---|
| Per test | $79, billed monthly |
| First test | $59.25 (25% off) |
| Shipping and tax | Added at checkout; amount not published. One independent review puts the all-in cost near $100 a test |
| Cadence | Monthly; skip up to 90 days at a time or cancel with no fees |
| Guarantee | 90-day money-back guarantee on a first purchase, if you complete the test and ask within 7 days of results |
| Where | All 50 states |
| HSA / FSA | Eligible |
At $79 for 25 markers, Rythm costs about $3.16 per biomarker before shipping, cheaper per marker than SiPhox's default panel ($4.81 all-in). Tested monthly, though, it adds up: 12 tests are $948 before shipping. Our blood test subscription guide compares the cadences.
Counting markers from Rythm's published list gives 27 for men and 28 for women: men get hematocrit and hemoglobin, women get progesterone, free T3 and free T4. Using the independent estimate of about $100 all-in per test, that is roughly $3.70 per marker for men and $3.57 for women, still below SiPhox's $4.81 on Longevity Essentials.
Our arithmetic from prices checked 29 Sep 2026: Function $365 / 160, Superpower $349 / 150, Rythm about $100 all-in / 27 (Crown Counseling estimate), SiPhox $274 / 62 and $149 / 31 with $25 shipping, Everlywell $399 / 83, InsideTracker $489 / 54. Headline counts include calculated ratios.
What Rythm Health tests
Rythm publishes its full list. Some markers are for one sex only.
| Area | Biomarkers |
|---|---|
| Hormones | Total and free testosterone, estradiol, progesterone (women), SHBG, cortisol |
| Thyroid | TSH; free T3 and free T4 (women only) |
| Heart | ApoB, LDL, HDL, total cholesterol, remnant cholesterol, hs-CRP, LDL-C:ApoB and total:HDL ratios |
| Metabolic | Vitamin D, ferritin, fructosamine, albumin, triglycerides, triglyceride:HDL ratio, uric acid |
| Blood | Hematocrit and hemoglobin (men only) |
| Kidney and liver | Creatinine, eGFR, ALP, GGT |
The notable gaps are HbA1c (Rythm uses fructosamine, a shorter-term sugar marker), Lp(a), thyroid antibodies and C-peptide. Fructosamine reflects average blood sugar over roughly the previous two to three weeks, while HbA1c reflects about three months and is the marker doctors use to screen for prediabetes and diabetes. SiPhox's default panel includes HbA1c, Lp(a) and C-peptide, and its Thyroid Focus panel adds TPO and thyroglobulin antibodies.
How the Rythm test works
- Rythm ships the kit within one to two business days; delivery takes about four days in total.
- Fast for 8 to 12 hours and collect first thing in the morning, as Rythm recommends.
- Warm your arm with the included pad, press the Tasso+ onto your upper arm, and let it fill.
- Send the sample back. Rythm's own lab runs it, a physician signs off, and results arrive within 48 hours of processing (within 3 business days of the lab receiving it).
If the sample is hemolyzed or too small, the lab rejects it and support advises on next steps; several reviewers say Rythm sent a free replacement kit.
Who Rythm Health suits
- Good fit: people on TRT or hormone therapy who want testosterone, estradiol and hematocrit every month; people tracking ApoB and lipids after a diet or medication change who want fast answers; anyone in New York or Hawaii, where SiPhox does not ship.
- Poor fit: anyone who needs HbA1c for blood sugar, wants Lp(a) measured, or wants a thyroid workup with antibodies. People who want one broad yearly checkup are better served by a lab-draw membership such as Function Health.
Rythm is also one of the few services here that ships to every state, and its guarantee lowers the risk of trying it: if you complete the first test and are unhappy, you can ask for your money back within 7 days of your results. Our best at-home blood tests ranking places it alongside SiPhox as the two at-home arm options worth considering.
Keep your expectations about the lab report realistic. Rythm's physician sign-off confirms results before release; it is not a consultation. Anything out of range should go to your own doctor, who can order a venous retest and act on it.
Finally, remember that Rythm asks for an 8 to 12 hour fast before you collect. SiPhox's EasyDraw instructions focus on hydration and warming the arm instead, which some people find easier to fit into a morning.
How accurate is an upper-arm sample?
Upper-arm devices like the Tasso+ and SiPhox's EasyDraw collect capillary blood, not blood from a vein. A 2025 peer-reviewed study of a similar upper-arm vacuum device found 17 of 19 common chemistry tests within CLIA accuracy limits against venous samples, with glucose and potassium the exceptions. That is encouraging for lipids, ApoB and hormones, but it is not a study of Rythm's own device and lab, and we did not find one published by Rythm. Treat any single result as a trend point, and ask your doctor for a venous retest before acting on a number far outside the range. Our guide to at-home blood test accuracy covers this in depth.
What Rythm Health customers say
On September 29, 2026 Rythm had 4.8 out of 5 from 2,984 Trustpilot reviews, with 87% five-star and 3% one-star, and it had replied to 70% of negative reviews. That is a better rating than Function Health (4.5), Superpower (4.5), InsideTracker (4.0) or SiPhox (4.7).
Trustpilot company pages, read 29 Sep 2026: Rythm 2,984 reviews, SiPhox 950, Function about 2,990, Superpower 361, InsideTracker 617.
- Praise: painless collection, fast results, quick and helpful support, replacement kits after failed draws.
- Complaints: missing or incomplete results (markers advertised but not reported), unexpected shipping charges, and occasional unhelpful replies.
Rythm Health pros and cons
- At-home upper-arm collection, no lab visit
- Results in about 48 hours from its own CLIA and CAP lab
- Physician sign-off on every result
- $79 a test; skip or cancel any time
- All 50 states; excellent Trustpilot rating
- 25+ markers, with no HbA1c, Lp(a) or thyroid antibodies
- Some markers limited to one sex
- Shipping cost not published up front
- One panel only; no bigger panel to switch to
- Asks for an 8 to 12 hour fast
How we scored Rythm Health
| Criterion | Weight | Score | Why |
|---|---|---|---|
| Biomarker coverage | 25% | 6.0 | 25+ with ApoB and hs-CRP; no HbA1c or Lp(a) |
| Cost per biomarker | 25% | 7.0 | About $3.16 per marker before shipping |
| Collection | 20% | 9.0 | Tasso+ upper-arm device at home |
| Lab quality and transparency | 15% | 7.5 | Own CLIA and CAP lab, physician sign-off, full list published |
| Results and follow-up | 15% | 8.5 | About 48 hours, money-back guarantee, easy skip |
| Overall | 7.5 / 10 |
Rythm vs SiPhox: the two at-home arm tests
Rythm and SiPhox are the only two mainstream services where you collect a full sample from your upper arm at home, so this is the comparison most readers need.
| Rythm Health | SiPhox Health | |
|---|---|---|
| Price | $79 + shipping | $124 + $25 shipping ($99 first test) |
| Biomarkers | 25+ | 31 default; 14 to 28 on other core panels; 62 on Ultimate 360 |
| HbA1c, Lp(a), C-peptide | No | Yes, on Longevity Essentials |
| Panels | One | Switch between four each test, or upgrade |
| Cadence | Monthly, skip up to 90 days | Monthly, quarterly or every 6 months |
| Results | About 48 hours | 7 to 10 days |
| Doctor review | Physician sign-off | Not included; $50 expert review |
| States | All 50 | All except New York and Hawaii |
Yearly cost at each cadence
| Tests a year | Rythm (before shipping) | SiPhox (with $25 shipping) |
|---|---|---|
| 2 | $158 | $298 |
| 4 | $316 | $596 |
| 12 | $948 | $1,788 |
Rythm is cheaper at every cadence even after shipping. What the extra money buys at SiPhox is breadth: HbA1c and Lp(a) on the default panel, and the option to rotate to kidney, liver and thyroid-antibody panels without changing company.
Our arithmetic from prices checked 29 Sep 2026. Rythm uses Crown Counseling's estimate of about $100 all-in per $79 test and ignores the $59.25 first-test offer. SiPhox uses the $99 first-test offer, then $124, with $25 shipping each time.
Say Mike, 41, is starting testosterone therapy and his doctor wants testosterone, estradiol and hematocrit watched closely for the first months. Rythm covers all three for men and returns results in about 48 hours; twelve monthly tests cost roughly $1,200 all-in, or about $1,180 with the $59.25 first test. SiPhox's Hormone Focus panel covers testosterone, estradiol and PSA but not hematocrit, while Longevity Essentials includes hemoglobin and hematocrit; twelve SiPhox tests cost $1,763 in year one. A common split is Rythm monthly for the hormone numbers, then a SiPhox Ultimate 360 test ($274) once a year for HbA1c, Lp(a), liver, kidney, iron and PSA. Dose decisions stay with the prescribing doctor.
Rythm or SiPhox? Match it to your goal
| If you want | Choose | Why |
|---|---|---|
| The cheapest monthly testosterone, estradiol and hematocrit check | Rythm Health | About $100 all-in, results in about 48 hours |
| Testing from New York or Hawaii | Rythm Health | All 50 states; SiPhox does not serve either |
| HbA1c, the standard three-month sugar marker | SiPhox Longevity Essentials | Rythm uses fructosamine, which covers about two to three weeks |
| Thyroid antibodies (TPO and thyroglobulin) | SiPhox Thyroid Focus | 21 markers including both antibodies, same $149 a test |
| Lp(a) once, plus ApoB and hs-CRP on a schedule | SiPhox Longevity Essentials | 31 markers including Lp(a), ApoB, HbA1c and hs-CRP, $149 a test with shipping |
Pick Rythm if you want the cheapest, fastest monthly check of hormones, lipids and ApoB. Pick SiPhox if you want HbA1c and Lp(a), thyroid antibodies or kidney and liver markers on rotation, or an occasional 62-marker Ultimate 360 test. Full detail in SiPhox vs Rythm Health and our EasyDraw guide.
Longevity Essentials
The default panel: heart, metabolic, hormone and inflammation markers in one draw.
Check price
Heart & Metabolic
Lipids plus kidney and liver function: the panel for cardiovascular and metabolic risk.
Check price
Ultimate 360
Everything on the four core panels plus iron studies, B12 and folate, GGT and PSA.
Check price
Frequently asked questions
Is Rythm Health legit?
Yes. It runs its own CLIA-certified, CAP-accredited lab, a licensed physician signs off results, and it has 4.8 out of 5 from about 2,984 Trustpilot reviews.
How much does Rythm Health cost?
$79 per test, billed monthly, plus shipping and tax. The first test is $59.25. You can skip up to 90 days or cancel at any time.
Is it Rythm or Rhythm Health?
The company spells it Rythm Health, without the h. Many people search for it as Rhythm Health.
Does the Rythm test hurt?
Rythm uses the Tasso+ device on the upper arm, and most reviewers describe it as painless. It is a small capillary sample, not a venous needle draw.
What is the difference between Rythm and SiPhox?
Both use an upper-arm device at home. Rythm is cheaper ($79) and faster (about 48 hours) with 25+ markers. SiPhox is $149 all-in with 31 markers by default, including HbA1c and Lp(a), and lets you switch panels. See SiPhox vs Rythm Health.
Sources
- Rythm Health: homepage and pricing (checked 29 Sep 2026)
- Rythm Health: FAQ (Tasso+ device, own lab, physician sign-off, guarantee; checked 29 Sep 2026)
- Rythm Health: full biomarker list (checked 29 Sep 2026)
- Trustpilot: Rythm Health reviews (4.8 from 2,984, read 29 Sep 2026)
- Crown Counseling: Rythm Health review (June 2026; all-in cost estimate)
- Diagnostics (Basel) 2025: performance of an upper-arm capillary blood collection device
- Function Health: pricing page (checked 29 Sep 2026)
- Trustpilot: Function Health reviews (4.5 from 2,990, read 29 Sep 2026)
- Superpower: membership pricing (checked 29 Sep 2026)
- Trustpilot: Superpower reviews (4.5 from 361, read 29 Sep 2026)
- InsideTracker store: plans and member prices (checked 29 Sep 2026)
- Trustpilot: InsideTracker reviews (4.0 from 617, read 29 Sep 2026)
- Everlywell 360: price, 83 biomarkers, Quest draw (checked 29 Sep 2026)
- SiPhox Health: membership, panels and pricing (checked 29 Sep 2026)
- SiPhox Health FAQ
- SiPhox Health panel comparison
- SiPhox Health: EasyDraw collection instructions
- SiPhox Health state coverage policy
- SiPhox Health refund policy
- SiPhox Health terms of service
- Trustpilot: SiPhox Health reviews