Cholesterol Levels and LDL

I got results back today and my LDL was stated as
moderately high as well as my total.  But my understanding is that LDL
is not directly measured, and rather an assumption that 20% of
triglycerides are part of the total is made to infer LDL (seems to
hold true for my numbers too).  Since my triglyceride level is so low,
and my HGL is so high, I am not sure if the assumption is still valid
or not???

Anyway, to the numbers:
137 LDL Bad
67 HDL Good
67 Triglycerides
217 Total

[Douglas Bogart, MD]

The LDL is not measured in some assays as you suggest.  You should have your  Framingham risk score calculated which will predict your overall cardiovascular risk taking into account your age and risk factors.