Reference
Biomarkers
What each bloodwork marker measures, the lab-reference range your clinician uses, and the longevity-optimal band the literature associates with lowest all-cause mortality. The two are NOT the same. This hub indexes our per-marker explainers and links into the bloodwork tracker tool.
Use the PhenoAge calculator → Open the bloodwork tracker → 12 Biomarkers Your Annual Physical Skips →
Aging composite
Albumin
→Liver-synthesized; tracks inflammation + nutrition
- Optimal
- 4.3-5.0 g/dL
- Lab range
- 3.5-5.0 g/dL
Creatinine
→Kidney filtration
- Optimal
- 0.8-1.1 mg/dL
- Lab range
- 0.7-1.3 mg/dL
Lymphocyte %
→Immune competence proxy
- Optimal
- 28-45%
- Lab range
- 20-50%
MCV
→Mean red-cell volume; B12 / folate signal
- Optimal
- 86-95 fL
- Lab range
- 80-100 fL
RDW
→Red-cell size variation; aging marker
- Optimal
- <12.5%
- Lab range
- 11.5-14.5%