How we work

The Metabolic Precision Suite · Patent pending

An answer is only as good as the way it was measured. This is how we measure.


A proprietary compilation of measures — cardiorespiratory fitness, body composition, and strength — each one, on its own, an independent predictor of mortality and the loss of function. Brought together into a single read, and included in every member’s assessment.

It is proof, not headline — an instrument, and a significant one, among the tools a physician brings to finding the mechanism and following it over time. Not a test you book, but part of how every member is evaluated from the start, and again as the years pass.

What it measures

Three measures, each predictive on its own.

Every member is evaluated across all three. Each was chosen because it independently predicts mortality and the loss of function — direct, validated, and hard to argue with. Read together, they give the physician a structural picture no single test provides.

01

Cardiorespiratory Fitness

VO₂max — how efficiently the heart, lungs, and circulation deliver oxygen under load — is the strongest single biomarker of longevity medicine has, and an independent predictor of heart disease and early death. We measure it directly, by VentriJect seismocardiography validated above 0.9 against traditional metabolic-cart testing.

02

DEXA Body Composition

A DEXA scan resolves lean mass, visceral fat, and bone density with a precision a scale cannot reach. Low muscle and excess visceral fat each independently raise the risk of diabetes, cardiovascular disease, and death — the structural baseline beneath metabolic and muscular health.

03

Grip Strength

Simple and deeply validated. Low grip strength independently predicts higher all-cause and cardiovascular mortality, falls, disability, and future loss of independence — a marker of whole-body strength and nervous-system function that moves as you do.

Read together, the three resolve into proprietary, patent-pending outputs.

Healthspan Index

Your biological fitness age

A single score, 0 to 100, combining fitness, body composition, and strength into the biological fitness age your body most resembles — whether it is functioning younger or older than the calendar says.

Sarcopenia Risk Score

An early neuromuscular flag

Reads low grip strength as an early indicator of sarcopenia — the age-related loss of muscle that begins decades before it is felt, and the frailty that follows it.

Part of every member’s assessment


Every member is evaluated this way from the start, and again as the years pass. Each measure is established medicine, independently tied to mortality and the loss of function, and available wherever the equipment is. What is proprietary is the compilation — the way Alternity brings them together into named outputs, like the Healthspan Index, and reads them as one picture over time. Not a test you book or a number you chase, but part of the relationship.


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The Suite is part of the relationship, not a service you book. Our practice manager — a registered nurse — makes first contact, personally.

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