LDL/ApoB ratio
What it measures, and what changes the number.
The LDL/ApoB ratio is a calculated value that divides LDL cholesterol by apolipoprotein B. Since each LDL particle carries one ApoB molecule, the ratio gives an indirect sense of how much cholesterol is packed into each particle, which is sometimes described as particle size.
It is not measured on its own. It comes from an LDL cholesterol result and an apolipoprotein B result from the same sample, and it is usually read with triglycerides, HDL cholesterol and non-HDL cholesterol.
Because it inherits the features of both inputs, it depends on whether LDL was calculated or measured directly, and on the fasting state if a triglyceride based formula was used. The units chosen for each input also change the number, so ratios from different labs may not be comparable. Labs may print it as LDL/ApoB Ratio.
Often read alongside: LDL cholesterol, Apolipoprotein B, Triglycerides, HDL cholesterol, Non-HDL cholesterol