There is also VLDL, which would be the part that is not HDL or LDL. The usual approximation is that VLDL = triglycerides / 5, but that is not always accurate (however, it may be used to calculate LDL after measuring total, HDL, and triglycerides directly). See question 3 and 4 in https://education.questdiagnostics.com/faq/FAQ164-retired0 .