Longevity testing — sometimes called a comprehensive health panel or full-body blood test — is a broad assessment of your body's key health markers through a single blood draw or at-home collection. Unlike a focused test ordered to investigate a specific symptom, a longevity panel looks at your health holistically: how your cardiovascular system is functioning, how well your body manages blood sugar, whether inflammation is present, how your hormones and thyroid are performing, and whether you're getting the nutrients your body needs.

No blood test can predict exactly how long you'll live — that's not the point. The goal is to identify patterns and risk factors that increase your chances of developing chronic disease, so you can address them proactively. Think of it like a regular MOT for your body: it checks the systems running quietly in the background that you might not think about until something goes wrong.

The chronic diseases that most commonly affect long-term health how long people live in good health — including cardiovascular disease, type 2 diabetes, and certain cancers, and metabolic dysfunction — develop overtime. [1] Many of these conditions show measurable warning signs in the blood, often before symptoms appear. [1]

all have measurable warning signs in the blood, often years before symptoms appear. [1] Catching those signs early gives you the best window to act.

One of the most important concepts in longevity medicine is healthspan — not just how many years you live, but how many of those years are spent in good health, with vitality and function intact. Extending your healthspan requires understanding not just whether you're sick today, but whether your body's systems are moving in a direction that supports or undermines long-term health.

Blood biomarkers are a window into those systems. They're objective, measurable, and — critically — many of them are modifiable through lifestyle changes. That last part matters enormously: knowing your numbers means you can track whether the choices you're making are actually moving the needle.

Lipid Panel and ApoB

A lipid panel measures the fat molecules in your blood, most commonly LDL cholesterol, HDL cholesterol, triglycerides, and total cholesterol. Elevated LDL and triglycerides, combined with low HDL, are associated with a higher risk of cardiovascular disease, the leading cause of death in the United States. [1,2]

More recently, ApoB, or apolipoprotein B, has emerged as a particularly meaningful cardiovascular biomarker. ApoB reflects the number of atherogenic lipoprotein particles and is considered by many experts to be a more precise measure of cardiovascular risk than LDL cholesterol alone. Each ApoB-containing particle has the potential to become trapped within the arterial wall, contributing to plaque formation and atherosclerosis. According to the American Heart Association, monitoring and managing lipid levels is a cornerstone of long-term heart disease prevention. [2,3]

HbA1c and Blood Sugar Regulation

HbA1c, or hemoglobin A1c, is a measure of your average blood sugar level over the past two to three months. It works by measuring the percentage of hemoglobin in your blood that has glucose attached to it, so the higher your average blood sugar, the higher your HbA1c. [4]

High HbA1c is associated with prediabetes and type 2 diabetes, both of which significantly increase the risk for cardiovascular disease, kidney disease, neuropathy, and other complications. But you do not need a diabetes diagnosis for this number to be meaningful. Even moderately elevated blood sugar in the prediabetes range can be an early indicator of increased metabolic risk. Testing your HbA1c now gives you a baseline and an opportunity to act while the trajectory is still changeable. [4]

High-Sensitivity C-Reactive Protein (hs-CRP)

C-reactive protein, or CRP, is produced by the liver in response to inflammation. The high-sensitivity version of this test, hs-CRP, can detect low levels of systemic inflammation, the kind that does not produce obvious symptoms but may be quietly damaging blood vessels and organs over time. [5]

Chronic low-grade inflammation is now recognized as a shared underlying mechanism in many of the diseases most associated with premature aging and death, including cardiovascular disease, type 2 diabetes, and certain cancers. The American Heart Association and the Centers for Disease Control and Prevention have jointly supported the use of hs-CRP as a cardiovascular risk assessment tool, particularly in people with intermediate cardiovascular risk. An elevated hs-CRP is a signal worth taking seriously and working to address through diet, exercise, stress management, and treating any underlying inflammatory conditions. [5]

Thyroid Function

Your thyroid gland, a small, butterfly-shaped gland at the base of your neck, regulates your metabolism, energy, heart rate, body temperature, and much more. Thyroid hormones affect nearly every organ system, and both hypothyroidism and hyperthyroidism can significantly affect quality of life and long-term health.

A thyroid panel typically includes TSH and free T4, with additional tests used when needed. TSH is often tested first, as it is the most sensitive marker for thyroid dysfunction. Undiagnosed or undertreated thyroid conditions can affect metabolism, energy levels, cardiovascular health, bone health, and overall well-being, making thyroid screening a meaningful component of a comprehensive health panel. [6]

Liver and Kidney Function

Your liver and kidneys are two of the most critical organs in your body. Both perform essential filtering and processing functions that keep you healthy. The liver metabolizes nutrients, produces proteins, regulates hormones, and removes toxins. The kidneys filter waste products and excess fluid from the blood.

Early liver disease and chronic kidney disease often develop without noticeable symptoms, making regular testing one of the best ways to detect them early. A comprehensive metabolic panel typically includes markers for liver function, such as ALT, AST, and bilirubin, and kidney function, such as creatinine, BUN, and eGFR. Identifying early-stage dysfunction gives your healthcare team, and you, the best opportunity to slow or reverse its progression. [7]

Vitamin D

Vitamin D plays a broader role in health than most people realize. It supports bone density, immune function, cardiovascular health, and mood regulation. Deficiency is common, particularly in people who spend most of their time indoors or live in lower-sunlight regions, and has been associated with increased risk for a range of chronic conditions. [8,9]

Testing your vitamin D level is one of the simplest ways to identify a correctable deficiency that may be affecting your health in multiple ways. Supplementation, when needed, is inexpensive and highly effective.

Complete Blood Count (CBC)

A complete blood count gives a broad overview of your blood health by measuring red blood cells, white blood cells, and platelets. It can identify anemia, signs of infection, immune system activity, and clotting function, all of which are relevant to how energized you feel, how well your immune system is functioning, and whether there are signs of underlying conditions worth investigating.

Hormones and Metabolic Markers

Depending on your age, sex, and health goals, a comprehensive longevity panel may also include markers like testosterone, estrogen, cortisol, fasting insulin, and DHEA-S. Hormonal health is closely tied to energy, body composition, bone density, cardiovascular health, and cognitive function. Hormone levels also change significantly across the lifespan, making periodic reassessment valuable.

For most adults, a comprehensive blood panel once a year is a reasonable baseline. If you're managing an existing condition, working to change a specific biomarker, or have significant risk factors for chronic disease, your healthcare provider may recommend more frequent testing.

The value of annual testing isn't just in any single result — it's in tracking trends over time. A single HbA1c reading tells you where you are today; five years of readings show you which direction you're moving.

Getting a comprehensive panel is only valuable if you use the results to inform action. Here is how to approach them:

Identify what is out of range and prioritize. You do not need to address everything at once. Work with a healthcare provider to determine which findings carry the most urgency and which can be addressed through lifestyle changes.

Set a follow-up timeline. If a result is mildly out of range, schedule a retest in 3–6 months after making targeted changes so you can evaluate whether your interventions are working.

Connect results to behaviors. Out-of-range lipids may warrant a closer look at dietary saturated fat intake and exercise habits. Elevated HbA1c may point to the need for changes in refined carbohydrate intake and physical activity. Elevated hs-CRP may indicate a need to prioritize sleep, stress management, and anti-inflammatory nutrition.

Share results with your healthcare team. A primary care provider can help interpret your results within the context of your full medical history and family background, adding important nuance to any individual biomarker.

Taking your health seriously means knowing your numbers — not just when something feels wrong, but proactively, as a regular practice. Everlywell 360 is Everlywell's most comprehensive at-home health panel, covering a wide range of biomarkers across cardiovascular health, metabolic function, thyroid, hormones, vitamins, and more. Samples are processed by CLIA-certified laboratories, and results are reviewed by independent physicians. It's one of the most complete ways to take stock of where your health stands today — and to identify where to focus your energy for the years ahead.