BONUS POST (13/12) — THE FIVE TESTS THAT AREN'T BLOOD, AND MAY MATTER MORE Everything above happens in a tube. These happen outside it — and for predicting how long you'll live, several of them beat anything on your lab report. VO2 max. Cardiorespiratory fitness may be the single strongest predictor of all-cause mortality we've ever measured. The Cleveland Clinic study of 122,000 adults found the least fit had 4-5x the death risk of the fittest — with no upper limit of benefit. Being in the bottom quartile for your age carries mortality risk comparable to smoking. Men over 40 should target above 40 ml/kg/min, women above 35. Measure it once a year. Coronary calcium score. Cheap, ten minutes, low radiation. It looks directly at your arteries instead of estimating risk from a calculator. But know the trap: zero calcium does not mean zero plaque. In the PROMISE trial, 25% of people who had a major cardiac event had a score of zero — because soft, rupture-prone plaque is invisible to it. Zero score plus real risk factors? Ask about CT angiography with AI plaque analysis. Grip strength. Thirty seconds, a $30 dynamometer, and it predicts all-cause mortality, cardiovascular death, and cognitive decline. It's a proxy for total-body muscle and neurological integrity. Track it yearly — the direction is what matters. A sleep study. If you snore or wake unrefreshed, get tested. Untreated sleep apnea drives hypertension, atrial fibrillation, insulin resistance, inflammation, and low testosterone. Treating it can improve nearly every marker in this thread at once. And the free one: home blood pressure. A $40 cuff. Morning and evening, seated quietly five minutes, arm at heart level, back supported. Office readings mislead in both directions — white coat hypertension and masked hypertension are both real, and both are missed by a single hurried reading. One more, calculated for free: PhenoAge biological age uses nine markers you probably already have — albumin, creatinine, glucose, CRP, lymphocyte %, MCV, RDW, alkaline phosphatase, and white count. Plug them into a free online calculator with your real age. The gap between the two numbers is the most honest scorecard you'll ever get. Your birth year is fixed. Your biological age is not. I wrote the complete guide to all of this — every test, every target, how to prepare, how to read your results, how to build the panel by budget, and the exact words to say when your doctor pushes back. It's free. No paywall. Nothing to sell you. Subscribe there and you'll get everything I write — cardiology, hormones, metabolic health, cancer screening, bone, longevity, and the frontier research most people never hear about until it's already standard of care. Written the way I'd want it written for my own family, including the inconvenient parts and the parts my profession gets wrong. And send this to the person who was just told "everything looks normal" and didn't know what to ask next. That sentence has cost more lives than almost anything else in medicine.