
The Cholesterol Test That's Been Sitting There Since 1994
Two years ago I barely knew what ApoB was. Now I think it's baffling we don't test it as standard — it's been a validated, standardised blood test since 1994, it costs next to nothing, and it may be the single most accurate predictor of cardiovascular risk we have. In this episode I explain what ApoB actually measures: one signalling molecule per lipoprotein particle, meaning it's a direct count of atherogenic particles rather than a measure of how much cholesterol mass those particles are carrying. I walk through chylomicrons, VLDL, IDL and LDL, and use a water-pipe analogy to explain why particle number — not just total cholesterol — determines how much damage reaches your arterial wall. I go deep on discordance: the phenomenon where someone can have a completely "normal" LDL cholesterol result and still be walking around with a dangerously high ApoB particle count, undiagnosed and under-treated. I also explain why your standard LDL-C result usually isn't even directly measured — it's estimated using an equation from 1972 that has real, well-documented limitations, especially at high triglycerides. I go through why the usual excuses — cost, lack of evidence, lack of standardisation — don't hold up, and where I sit on my own ApoB results. Sources: Marcovina et al. 1994 Clinical Chemistry (ApoB standardisation), Sniderman et al. 2024 European Heart Journal (UK Biobank discordance study), Sniderman et al. 2011 Circulation: Cardiovascular Quality and Outcomes (meta-analysis), Friedewald et al. 1972 Clinical Chemistry (LDL-C estimation equation). This is informational purposes only, not medical advice. If you can't get seen by your own physician, by all means do so, but always speak to your own healthcare provider. New episodes weekly — subscribe to stay on top of the biomarkers actually worth knowing.