
What bloodwork actually matters in your 40s
ApoB, ferritin, hormones, inflammation — the markers worth knowing, and how to read them.
Function Health is a membership-based lab testing platform designed for people who want broader visibility into biomarkers and longitudinal health trends.
People who want broad bloodwork visibility, repeated testing, and a consolidated dashboard for health optimization.
These are editorial signals, not endorsements. Always pair with qualified medical guidance.
A short due-diligence list to apply before paying, booking, subscribing, or building a routine around any longevity tool, test, or program.
What exactly will this measure, track, or improve — and over what time horizon?
Is there medical or clinician oversight, and how qualified are the people behind it?
How should I interpret the data, and what does a meaningful change actually look like?
What will I do differently with the results? If the answer is unclear, the signal isn't useful yet.
Is the claim evidence-led or marketing-led? Where is the underlying research?
What is the true cost after the first purchase, test, or subscription — including renewals?
Does this replace medical advice? It should not. Where does professional care still belong?
How does this compare to simpler, lower-cost, or higher-evidence alternatives?
InsideTracker analyzes blood biomarkers and provides personalized nutrition, exercise, supplement, and lifestyle recommendations.
Labcorp OnDemand offers consumer lab testing through Labcorp’s laboratory network.
Quest Health lets consumers purchase lab tests online and complete testing through Quest locations.
SiPhox Health offers at-home biomarker testing, trend tracking, and personalized insights.
10X Health offers precision health testing, genetic testing, and optimization-oriented wellness programs.
Broad lab panels can surface useful information but also require careful interpretation. Abnormal or concerning results should be reviewed with a qualified clinician.

ApoB, ferritin, hormones, inflammation — the markers worth knowing, and how to read them.

What each test really tells you — and where the marketing outruns the science.