Calculate the LDL-C/ApoB ratio from lipid lab values in mg/dL or mmol/L and g/L, with low, typical, or high interpretation guidance.

LDL-C/ApoB Ratio Calculator

Enter your two lab values and tap Calculate.

US units (mg/dL)
mmol/L & g/L
mg/dL
mg/dL
mmol/L
g/L

Educational use only; not medical advice. Use LDL-C and ApoB values from a recent laboratory blood test. Do not use this calculator to diagnose, treat, or change medications—discuss results with a qualified clinician.

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LDL-C/Apob Ratio Formula

The following formula is used to calculate the LDL-C/Apob ratio.

R = \frac{L}{A}

Variables:

  • R is the LDL-C/Apob ratio
  • L is the LDL cholesterol (typically reported in mg/dL; other units such as mmol/L can be converted)
  • A is the Apolipoprotein B (typically reported in mg/dL; other units such as g/L can be converted)

To calculate the LDL-C/Apob ratio, divide the LDL cholesterol by the Apolipoprotein B.

What is the LDL-C/Apob Ratio?

The LDL-C/Apob ratio compares the amount of LDL cholesterol (LDL-C) to Apolipoprotein B (ApoB). LDL-C is often referred to as “bad cholesterol” because higher levels can be associated with atherosclerotic cardiovascular disease risk. ApoB is a structural protein found on atherogenic lipoprotein particles (including LDL, IDL, VLDL remnants, and Lp(a)), and is commonly interpreted as reflecting the number of these particles. The LDL-C/ApoB ratio is sometimes used to explore how much cholesterol is carried per ApoB-containing particle and patterns of “discordance,” but interpretation should be done with a clinician.

How to Calculate LDL-C/Apob Ratio?

The following steps outline how to calculate the LDL-C/Apob Ratio.

  1. First, determine the LDL cholesterol (L) in mg/dL.
  2. Next, determine the Apolipoprotein B (A) in mg/dL.
  3. Finally, calculate the LDL-C/Apob ratio using the formula R = L / A.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

LDL cholesterol (L) = 130 mg/dL

Apolipoprotein B (A) = 80 mg/dL