The Best Biomarkers to Test in 2026 (and How to Get Them)

Disclosure: Vital Signs Today may earn a commission if you buy through links on this page, at no extra cost to you. This does not influence our evidence-based assessments. We are not a medical provider; talk to a clinician before acting on test results.

Quick answer: The biomarkers worth testing fall into five buckets: metabolic (fasting insulin, HbA1c, triglycerides), cardiovascular (ApoB, Lipoprotein(a), hs-CRP), hormones (thyroid, testosterone, estradiol), nutrients (vitamin D, ferritin, B12), and organ function (liver, kidney, CBC). The fastest way to cover all five in one sitting is a comprehensive blood panel rather than a stack of single-marker kits. For most health-conscious adults, the Superpower biomarkers test is our top pick: $199 per year buys one annual draw covering 100+ biomarkers (about 150 with calculated ratios), 17 plain-language health scores, and an action plan you can actually use. If you want maximum clinical depth and don’t mind paying more, Function Health is the serious alternative.

Disclosure: Vital Signs Today may earn a commission if you buy through links on this page, at no extra cost to you. This does not influence our evidence-based assessments. We are not a medical provider; talk to a clinician before acting on test results.

Why a comprehensive blood panel beats chasing single markers

Most people start backwards. They feel tired, Google one symptom, and order a single vitamin D or thyroid kit. The problem is that biomarkers don’t live in isolation. Fatigue can be low iron, an underactive thyroid, poor blood sugar control, low testosterone, or a B12 deficit, and a one-marker test can’t tell you which.

A comprehensive blood panel solves this by giving you the whole dashboard at once. You see the metabolic, cardiovascular, hormonal, and nutrient systems side by side, so a borderline number in one area can be read in the context of the others. It is also cheaper per marker. Buying ten separate single-marker kits usually costs far more than one bundled panel, and you only get poked once.

This is the core reason a yearly baseline service has become the smart default. Instead of reacting to symptoms, you build a record you can track over time, which is where the real signal lives.

There is a behavioral payoff too. When you can see all five systems on one screen, you stop treating your health as a pile of unrelated complaints and start managing it like a single system with a few key levers. A borderline metabolic number next to a rising inflammation marker tells a story that neither would tell alone, and that story is what turns a lab report into a plan you will actually follow.

The biomarkers that actually matter (and what they tell you)

You don’t need 300 markers. You need the right 100 or so, organized into the systems that drive how you age. Here is the short list we’d insist on in any panel.

Metabolic health

Fasting insulin and HbA1c catch insulin resistance years before fasting glucose looks abnormal. Triglycerides and the triglyceride-to-HDL ratio round out the picture. These four are the early-warning system for type 2 diabetes and metabolic syndrome, and they are routinely missed on a basic checkup.

What the numbers mean. HbA1c under 5.7% is the standard non-diabetic cutoff, but many clinicians treat anything above roughly 5.4% as a nudge to tighten diet and movement. Fasting glucose under 100 mg/dL is normal, though the tighter target sits in the low 80s to low 90s. Fasting insulin has no universal optimal flag on most reports, which is exactly why it gets missed, a value in the mid-single digits (roughly under 8 to 10 uIU/mL) is what you want to see. Triglycerides under 150 mg/dL is standard, under about 90 is better, and a triglyceride-to-HDL ratio under 2 is one of the cleanest quick reads of insulin sensitivity a basic panel can give you. Labs vary, so read your own report reference column, not just these rules of thumb.

Cardiovascular risk

Standard cholesterol panels undersell heart risk. ApoB counts the actual number of artery-clogging particles, Lipoprotein(a) flags an inherited risk most people never get tested for once in their life, and hs-CRP measures the inflammation that drives plaque. If a panel skips these, it is not a serious cardiovascular panel.

What the numbers mean. ApoB is reported in mg/dL and lower is better for anyone focused on prevention. Population normal runs high because most people carry more particles than is ideal, so treat the optimal target as meaningfully below the lab upper limit and set your personal goal with a clinician. Lipoprotein(a) is largely genetic and you only need to measure it once, a high reading will not move with diet but it does change how aggressively you and your doctor manage every other risk factor. hs-CRP under 1.0 mg/L signals low vascular inflammation, 1 to 3 is intermediate, and above 3 is worth repeating once you are not fighting a cold or recent injury, since any infection temporarily spikes it.

Hormones

A full thyroid read (TSH, free T4, free T3) plus sex hormones (testosterone, estradiol, and for some, DHEA-S) explains a huge share of energy, mood, libido, and body-composition complaints. Hormones are where people most often discover the cause of symptoms they had written off as aging.

What the numbers mean. TSH sits in most lab ranges around 0.4 to 4.0 mIU/L, but symptoms of an underactive thyroid often show up in the upper half of that normal band, which is why free T4 and free T3 matter, they reveal whether the active hormone is actually reaching your tissues. Testosterone and estradiol ranges are wide and age-dependent, so the useful move is to read them against your symptoms and your own prior results rather than against the population range alone. One practical trap: high-dose biotin supplements can distort several hormone immunoassays, so pause biotin for a few days before testing.

Nutrients and organ function

Vitamin D, ferritin, B12, and magnesium are the deficiencies most likely to be both common and fixable. Layer on a complete blood count plus liver and kidney panels, and you have the organ-function baseline that tells you the rest of the numbers can be trusted.

What the numbers mean. Vitamin D is commonly flagged deficient below 20 ng/mL and sufficient above 30, with many practitioners aiming for the 30 to 50 range. Ferritin is the sneaky one: it can read normal at the very bottom of the range while you are functionally iron-depleted, and it rises with inflammation, so a normal ferritin during an illness can mask a real deficiency. B12 in the low-normal band paired with fatigue is worth rechecking, sometimes with methylmalonic acid, rather than dismissing. This is the whole argument for a full panel: one nutrient number rarely tells the story on its own.

The organ-function markers are the quiet backbone of the panel. Liver enzymes (ALT, AST), kidney markers (creatinine, eGFR), and a complete blood count rarely make headlines, but they tell you whether the rest of your results can be trusted and they catch problems, from fatty liver to early kidney strain to anemia, that often carry no symptoms until they are advanced. When people say a full panel gives peace of mind, this is usually the part doing the reassuring.

Here is how this plays out in practice. Someone comes in tired and assumes it is low iron, orders a single ferritin kit, and it reads mid-range, so they shrug and move on. A full panel on the same person shows ferritin low-normal, a TSH creeping toward the top of range, and a fasting insulin quietly elevated. No single marker was screaming, but together they explain the fatigue and point at three fixable levers. That is the case for the dashboard over the spot-check.

Superpower biomarkers test: our top pick for a yearly baseline

The Superpower biomarker test is built exactly around the logic above. For $199 per year, you get one comprehensive annual blood draw covering 100+ biomarkers, roughly 150 once you count calculated ratios, spanning metabolic, cardiovascular, hormonal, nutrient, and organ-function markers in a single sitting.

What sets it apart for a non-clinician is the translation layer. Results come back as 17 plain-language health scores plus a personalized action plan, and there is an AI concierge you can chat with about what any number means. That turns a wall of lab values into something you can act on, which is the part most testing services get wrong.

A few honest caveats. Superpower is a screening and tracking service, not a diagnostic clinic, so think of it as the annual baseline that tells you where to look, not a replacement for a doctor. Pricing is also higher in two states: it is $399 in New York and New Jersey because of state lab rules. Outside those states, $199 for this much coverage is the best value-per-marker we’ve found.

Superpower vs Function Health: which yearly panel wins?

This is the comparison most readers are really weighing, so let’s be direct about it.

Function Health

Function Health is the more clinically thorough option. At $365 per year you get 160+ biomarkers, two draws per year instead of one, a urinalysis, and a 6-month retest built into the membership. That cadence is genuinely useful if you’re actively changing something (a new medication, an aggressive nutrition or training block) and want to see movement mid-year rather than waiting twelve months.

The trade-offs: it costs roughly 83% more than Superpower, and its AI chat layer is newer. You’re paying for breadth and a second draw, which not everyone needs.

Superpower

Superpower wins on price, simplicity, and the action layer. One draw a year, 100+ biomarkers, 17 scores, an action plan, and an AI concierge for $199. For someone who wants a strong annual baseline they can actually understand and revisit, this is the better starting point.

Our take: if you’re new to biomarker testing or want the best coverage-per-dollar, start with Superpower. If you’re a data-maximalist who wants two draws and a built-in retest and the price is no object, Function Health earns its premium. Most people are better served by the $199 baseline, then deciding whether they truly need more.

When a single-marker kit makes more sense

A full panel is not always the right call. If you already have a recent comprehensive panel and just want to recheck one number, paying for the whole dashboard again is wasteful.

This is where at-home single-marker testing fits. Everlywell sells at-home single-marker kits run through CLIA-certified labs with results delivered online, which is ideal when you need one or two targeted markers (say, a vitamin D recheck or a thyroid spot-check). SiPhox Health is worth a look too if a finger-prick option matters more to you than a venous draw, since it offers finger-prick collection and longevity-focused panels.

For most other brands you’ll see (InsideTracker, Viome, Lifeforce, Quest Health, Mito Health and similar), check the provider for current pricing and exactly which markers are included before you buy, because lineups and prices shift often. The general rule holds: targeted recheck, use a single-marker kit; full annual baseline, use a comprehensive panel.

How to actually get tested (and read your results)

The process is simpler than people expect. With a service like Superpower you sign up online, book a blood draw at a partner lab near you, fast beforehand if instructed (this matters for glucose, insulin, and lipids), and get your results back digitally within days.

It helps to know what the day itself looks like. A partner-lab draw takes only a few minutes, most people are in and out in under fifteen, and results typically post to your dashboard within a few business days. Save the summary or PDF each year, because your own history is the most valuable comparison you will ever have, more useful than any population average.

When the numbers arrive, look at trends and ratios first, not just whether each marker is inside the reference range. Reference ranges are wide, and “normal” is not the same as “optimal.” A value can sit at the bottom edge of normal and still be the thing dragging down how you feel. This is exactly why a comprehensive blood panel you repeat yearly beats a one-off snapshot: the second draw tells you whether a number is moving in the right direction, and direction often matters more than the single reading.

One short but important caveat: any result that falls outside the normal range should be reviewed with a qualified clinician before you act on it. A testing service flags the signal; a doctor confirms what to do about it. Used that way, the Superpower biomarkers test functions as your yearly early-warning radar, and your physician handles the diagnosis and treatment if anything genuinely needs it.

Optimal vs standard: why the reference range is only the starting line

The single most useful mental shift in biomarker testing is separating normal from optimal. A lab reference range is a statistical band drawn from a broad population, including plenty of people who are not especially healthy. Landing inside it means you are not an obvious outlier, not that your number is where it does the most good. Optimal ranges are tighter and aimed at long-term risk reduction, and they are where informed readers try to live.

Two caveats keep this honest. First, ranges differ between labs because they use different equipment and assays, so always read the reference column on your own report rather than a number you saw online. Second, optimal targets are context-dependent: age, sex, pregnancy, and existing conditions all move the goalposts, and some markers have no consensus optimal at all. Use optimal ranges to ask better questions, then let a clinician confirm what your specific numbers mean for you.

How to prepare so your blood draw is accurate

Small prep mistakes are the most common reason a number looks off. Fasting is the big one: glucose, insulin, and triglycerides all move after a meal, so most comprehensive panels ask for an 8 to 12 hour fast, water only. Book a morning slot if you can, because cortisol, testosterone, and iron all follow a daily rhythm and run highest earlier in the day, and testing at the same time each year keeps your trend line honest.

Hold hard exercise for 24 hours before the draw. A tough workout can transiently raise markers like CK and even nudge liver enzymes, which reads as a false alarm. Alcohol the night before affects triglycerides and liver values, so skip it. Stay well hydrated, since a dehydrated draw concentrates the blood and can slightly inflate several counts. And flag your medications and supplements: high-dose biotin interferes with many immunoassays including thyroid and some hormone tests, and iron supplements taken that morning can skew an iron panel. When in doubt, ask the ordering service what to pause and for how long.

How often should you retest?

For a healthy adult building a baseline, once a year is the sensible default, which is exactly why the annual-membership model fits most people. The value compounds: your second and third draws turn a single snapshot into a trend, and direction of travel usually matters more than any one reading.

Retest sooner, at roughly 3 to 6 months, when you are actively changing something and want to see whether it worked: a new medication, a serious nutrition or training block, or a supplement started to correct a specific deficiency. A corrected vitamin D or ferritin, for instance, is worth rechecking within a few months rather than waiting a full year. And any out-of-range result your clinician wants to confirm should be repeated on their timeline, not yours.

Two common mistakes that waste a good panel

The first mistake is testing once and never again. A single draw is a photograph, useful, but it cannot tell you whether a borderline number is climbing or falling. The whole payoff of biomarker testing shows up on the second and third draw, when a value you were watching either drifts toward optimal or does not, and you finally learn whether your changes are working.

The second is acting on one flagged number in isolation. A slightly high liver enzyme after a weekend of drinking, a ferritin that dipped during a cold, a cholesterol reading taken without fasting: any of these can send someone down a rabbit hole. The fix is context. Read the flagged marker alongside the related ones, repeat it under clean conditions, and bring anything that stays abnormal to a clinician before you rebuild your life around it.

Related reading on Vital Signs Today

• Superpower Blood Test Review (2026): Is It Worth the Membership?
• How Much Does Superpower Cost? Full 2026 Pricing Breakdown

Frequently asked questions

What biomarkers does the Superpower biomarker test include?

The Superpower biomarkers panel covers 100+ biomarkers (about 150 counting calculated ratios) across metabolic, cardiovascular, hormonal, nutrient, and organ-function categories, then distills them into 17 plain-language health scores plus a personalized action plan. It is designed as a comprehensive blood panel you repeat once a year to track trends.

How much does the Superpower biomarkers test cost?

Superpower is $199 per year for one annual draw in most states. It is $399 in New York and New Jersey due to state lab rules. That membership price includes the panel, the 17 scores, the action plan, and access to the AI concierge.

Is Superpower or Function Health better?

Function Health is more clinically thorough at $365 per year with 160+ biomarkers, two draws, a urinalysis, and a 6-month retest. Superpower is the better-value yearly baseline at $199 with 100+ biomarkers and a stronger action layer. Start with Superpower unless you specifically need two draws and a built-in mid-year retest.

Do I need a comprehensive blood panel or just a few markers?

If you’re building a baseline or troubleshooting vague symptoms like fatigue, a comprehensive blood panel is more useful and usually cheaper per marker than buying several single-marker kits. If you already have recent full results and only want to recheck one number, an at-home single-marker kit from a provider like Everlywell is the more economical choice.

What’s the most important biomarker to test?

There isn’t a single one, but if forced to pick, ApoB and fasting insulin punch above their weight because they catch cardiovascular and metabolic risk years earlier than the markers on a standard checkup. The better move is testing them together in one panel so each number can be read in context.

How should I prepare for a comprehensive blood panel?

Fast for 8 to 12 hours with water only, book a morning appointment, skip alcohol and hard exercise for 24 hours beforehand, stay hydrated, and tell the service about any medications or supplements. Pause high-dose biotin for a few days, since it can distort thyroid and hormone immunoassays. Consistent conditions year to year make your trend line trustworthy.

What does it mean if a result is normal but I still feel off?

Reference ranges are wide and built around the general population, not the optimal zone, so a value can sit at the low or high edge of normal and still be the thing affecting how you feel. Thyroid, ferritin, vitamin D, and fasting insulin are classic examples. Read each number against your symptoms and your own past results, and review borderline findings with a clinician rather than treating in range as the finish line.

Are at-home finger-prick tests as accurate as a venous draw?

For many markers a well-run finger-prick test through a CLIA-certified lab is reliable, which is why services like SiPhox exist. That said, a venous draw remains the standard for a broad panel and for markers where sample volume and handling matter. If you want one clean, comprehensive baseline, a venous draw is the safer default, and finger-prick options are best for convenient single-marker rechecks.