Does Lp(a) raise your LDL cholesterol reading?

It raises your calculated LDL-C, yes. The standard LDL-C calculation accidentally counts the cholesterol carried inside Lp(a) particles as if it were LDL, inflating the result by roughly 8–20% depending on how high your Lp(a) is. So a stubbornly high LDL-C despite a statin and clean diet can be partly Lp(a).

How do you correct LDL-C for Lp(a)?

A common estimate is that the cholesterol within Lp(a) is about 0.077 mg/dL per nmol/L of Lp(a) (or roughly 30% of the Lp(a) mass in mg/dL). Subtracting that from measured LDL-C gives a rough 'Lp(a)-corrected' LDL-C. It's an approximation — the real fraction varies with apo(a) isoform and assay — so it's a sense-check, not a clinical value.

Does this change my treatment target?

No. This is an estimate to help you understand a stubbornly high LDL-C, not a clinical LDL value. Your treatment target is a decision for the doctor who manages your lipids.

Tool

How much of your LDL-C is really Lp(a)?

If your LDL-C looks stubbornly high despite a statin and a clean diet, a high Lp(a) may be part of the reason — the standard LDL calculation counts Lp(a)’s cholesterol as LDL. Enter your numbers to estimate how much of your measured LDL-C is actually Lp(a)-cholesterol. It’s a rough sense-check, not a clinical value.

Your numbers

Measured LDL-C (mg/dL)

Lp(a) (nmol/L)

Enter your measured LDL-C and your Lp(a) to estimate how much of that LDL-C is actually Lp(a)-cholesterol being miscounted.

For the full picture on Lp(a) — testing, reading your number, and what you can actually do — see the Lp(a) guide.