For those of us on a low carbohydrate lifestyle – the “Iranian” formula used above can perhaps give a better “estimation” of LDL when our Triglycerides are nice and low. However the Iranian study was made with people with elevated cholesterol. Hopefully one day, a study may be done with “healthy” people (and thus develop a more accurate formula)!
Here’s the calculator: http://homepages.slingshot.co.nz/~geoff36/LDL_mg.htm
Friedewald (1972) Formula: LDL = TC – HDL – TG/5.0 (mg/dL) Reference.
“Iranian” (2008) Formula: LDL = TC/1.19 + TG/1.9 – HDL/1.1 – 38 (mg/dL) Reference.