You’ve likely heard plenty about LDL (“bad”) and HDL (“good”) cholesterol, but there’s another heart-health marker worth knowing: ApoB. This lesser-known blood test can offer a more accurate picture of whether the fats circulating in your bloodstream are likely to turn into artery-clogging plaque—and raise your risk of heart disease. “ApoB may be a better marker for heart disease risk since it reflects all of the bad particles that can drive heart disease, rather than just looking at LDL