Longevity medicine has acquired a reputation it partly deserves: expensive panels, hundreds of numbers, supplements sold at the end. What follows is the opposite of that. Four measurements carry most of the signal, they are cheap by comparison, and reading them properly means reading them together and over years rather than individually and once.
Cardiorespiratory fitness
If you were allowed to know only one thing about a person's likely future, this would be a defensible choice. Cardiorespiratory fitness — expressed as VO2max, the maximum rate at which you can use oxygen — is among the strongest predictors of all-cause mortality that has been measured, and the association is graded: each step up the distribution is associated with lower risk, with the steepest gain at the bottom end. Moving from the least fit fifth of the population to the next fifth is associated with a larger benefit than almost any single medication.
It can be measured directly on a treadmill test with gas analysis, or estimated from a submaximal protocol. The estimate is less precise but adequate for tracking, and tracking is the point. A single value tells you where you sit; a value repeated annually tells you which direction you are going, which is the more useful fact.
Grip strength
Grip strength is measured with a hand dynamometer in under a minute and is a surprisingly good proxy for whole-body muscle function. It predicts mortality, cardiovascular events and disability in large cohorts, and it does so largely because it stands in for total lean mass and neuromuscular integrity rather than because hands matter especially.
Its practical value is that it is trivially repeatable, so a decline shows up clearly. Loss of muscle with age is not cosmetic: it is the difference between an independent decade and a dependent one, and it is largely preventable by resistance training, which is why training is treated as a prescription in this programme rather than as general advice.
ApoB
Standard lipid panels report LDL cholesterol, which measures the cholesterol carried inside particles. ApoB counts the particles themselves — one molecule of apolipoprotein B per atherogenic particle. Since it is the particles that lodge in the arterial wall, the count is the more direct measure of the thing that causes atherosclerosis, and where the two disagree — which happens particularly in people with insulin resistance, high triglycerides or diabetes — ApoB is the better guide to risk.
It is inexpensive, does not require fasting, and is under-used mainly through habit. In our practice it is most useful in the situation where the standard panel looks acceptable and the clinical picture does not, which is exactly where a treatment decision is otherwise made on a coin toss.
Body composition
Weight tells you almost nothing on its own, and BMI little more. A DEXA scan separates fat mass from lean mass and shows where the fat is — and visceral fat, the fat around the organs, carries metabolic risk that subcutaneous fat does not. Two people at identical weights can have entirely different metabolic futures.
This matters most during weight loss. A large share of the weight lost on GLP-1 medication can be lean mass, and losing thirty pounds of which a third is muscle is a worse outcome than losing twenty of which almost none is. Measuring composition rather than weight is what makes that visible, and it is why our weight management programme sets protein and resistance training at the start rather than after the scan looks wrong.
What is deliberately not on the panel
Broad untargeted blood panels, whole-body scans in people without symptoms, and most of the commercial biological-age tests. They generate incidental findings that lead to investigation, anxiety and occasionally harm, without a demonstrated benefit. If a test will not change what we do, we do not order it.
Reading them together
The four numbers are inputs to an estimate, and the estimate is of how long you are likely to live and in what state. That estimate comes with wide error bars, and we say so. Its purpose is not prophecy; it is to make specific decisions better.
The clearest example is cancer screening. Screening tests find cancers that take years to cause harm, so their value depends on having those years. A man of seventy-five with excellent fitness, good strength and no significant disease has a longer likely horizon than his chronological age suggests, and continued prostate screening or colonoscopy may serve him well. A man of sixty-eight with poor fitness, low muscle mass and several conditions may be harmed by finding a slow cancer he will not live long enough for it to trouble. Age alone is a poor way to make that distinction; these measurements are better.
The same logic applies to how aggressively blood pressure and lipids are treated, and to whether a treatment whose benefit accrues over fifteen years is worth its immediate costs.
What the panel is not
It is not a biological age score, and we do not issue one. It is not a hormone optimisation programme — testosterone is managed when labs and symptoms call for it, with the fertility consequences stated plainly, and not otherwise. It is not a supplement protocol; where something has evidence we will say so, and where it does not, we will say that instead.
The approach is set out at length in UroLongevity and is what our longevity medicine programme runs on.
Questions patients ask
How often should these be repeated?
Annually for most people, which is often enough to show a trend and rarely enough to avoid chasing noise. If you are actively changing something — training, losing weight, starting a treatment — a six-month interval on the affected measure makes sense.
Can I improve VO2max at my age?
Yes, at every age that has been studied. The gains are largest for those starting from the lowest fitness, which is the opposite of how most people assume it works, and they come from a combination of sustained moderate work and a smaller amount of harder intervals.
Is ApoB better than a standard cholesterol panel?
It is a more direct measure of the particles that cause atherosclerosis, and it is most useful where the standard panel and the clinical picture disagree — common in insulin resistance, high triglycerides and diabetes. It does not replace the standard panel so much as settle the cases the standard panel leaves ambiguous.
Do I need a DEXA scan, or is a body composition scale enough?
A scale is adequate for tracking direction if you use the same one under the same conditions. DEXA is considerably more accurate and shows visceral fat specifically, which matters most at the start of a programme and when significant weight loss is underway.
Will you tell me my biological age?
No. The commercial biological-age scores vary between providers, move with things that do not matter, and do not change what we would advise. We would rather give you four measurements you can act on.
Make an appointment
Manhattan (212) 991-9991 · Forest Hills (718) 360-9550 · same-week visits and most major insurance accepted.