Longevity
Biomarkers, healthy aging, preventative health, and lifespan research.
103 articles in Longevity · page 3 of 9
AST on a Blood Test: What It Adds Beyond ALT
AST is not a liver-specific enzyme, which is why it is read next to ALT rather than alone. What the ratio between them does and does not predict.
Read →Hematocrit on a Blood Test: What the Percentage Means
Hematocrit is the share of blood volume made of red cells. What counts as high, and why one long cohort's cardiovascular signal vanished under adjustment.
Read →MCH and MCHC on a Blood Test, Explained
MCH is hemoglobin per red cell; MCHC is hemoglobin concentration within it. One is mostly redundant, the other is the index most likely to be an artefact.
Read →MCV on a Blood Test: What Red Cell Size Means
MCV measures average red blood cell size. A high result is common, usually not about anemia, and most often points somewhere other than iron.
Read →MPV on a Blood Test: What Platelet Size Tells You
MPV measures average platelet size. It carries real prognostic weight in acutely ill patients — and much less on a routine panel in a healthy adult.
Read →SGPT and SGOT vs ALT and AST: Same Tests, Old Names
SGPT is ALT and SGOT is AST — the same two enzymes under older nomenclature. Which labs use which, and why your report may not match what you read online.
Read →White Blood Cell Count: What WBC Says About Aging
WBC has a J-shaped relationship with mortality, and the risk starts inside the normal range. In one cohort it began rising five years before death.
Read →ASCVD 10-Year Cardiovascular Risk, Explained
What an ASCVD score means: how the Pooled Cohort Equations estimate 10-year risk, the inputs they use, and how clinicians read the number.
Read →FFMI Explained: Muscle Mass and the Natural Limit
What is FFMI, how the fat free mass index is calculated, and why the ~25 natural FFMI limit is a useful heuristic rather than a hard rule.
Read →The Navy Body Fat Method, Explained
How to estimate body fat at home with a tape measure: the Navy method's circumference math, and where it beats and trails calipers and DEXA.
Read →MitoSS-31 vs SS-31: What You're Actually Getting
The product is research-grade SS-31 (elamipretide). The clinical drug is now FDA-approved for one rare disease, and failed most other trials.
Read →L-Carnitine for Fat Metabolism and Recovery: What the Research Shows
L-carnitine shuttles fat into mitochondria, but human evidence for weight loss and recovery is modest — and there is a gut-microbiome signal.
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