Resources
Reference material, in one place
The things worth looking up rather than reading front to back. Short, plain and cited where a source exists.
Reference
Understanding your labs
A plain reference for markers that come up in this space. What each one is, in one line. None of this interprets your results, which is a job for a clinician who knows your history.
| Marker | Area | In one line |
|---|---|---|
| ApoB | Metabolic health | A count of the lipoprotein particles that can lodge in an artery wall. More on ApoB |
| HbA1c | Metabolic health | A rolling three month average of blood glucose. Useful, and late. More on HbA1c |
| Triglycerides | Metabolic health | Circulating fat, closely tied to how you are handling carbohydrate and alcohol. |
| Fasting insulin | Metabolic health | Often rises long before glucose does, which is what makes it informative early. |
| Visceral fat | Metabolic health | Where fat sits, not just how much of it there is. More on Visceral fat |
| Total and free testosterone | Hormone and vitality | Timing and repeat measurement matter. A single value rarely settles anything. |
| SHBG | Hormone and vitality | Changes how much of a hormone is available, which is why totals can mislead. |
| Thyroid panel | Hormone and vitality | Overlaps heavily with the symptoms people attribute to other hormones. |
| Ferritin | Hormone and vitality | Iron status. A common and easily missed cause of fatigue. |
| hs-CRP | Longevity and recovery | A general marker of inflammation, easily disturbed by recent illness. |
| Cardiorespiratory fitness | Longevity and recovery | Not a blood test, and one of the strongest associations in the literature. More on Cardiorespiratory fitness |
| Grip strength | Longevity and recovery | A crude proxy for overall strength that tracks with function later in life. |
Start here
Where to read next
Three different jobs, three different pages.
Reading
Blog
Guides, biomarker explainers and short primers on the physiology behind how you feel.
Read ›
Standards
Science and research
What we will claim, what we will not, and the evidence behind each pillar.
Read ›
Answers
FAQ
Common questions about care, privacy and how early we are, including the ones without a flattering answer.
Read ›