Can anyone help work out my LDL?

My current overall cholesterol is 5.9 but it hasn't been broken down into LDL/HDL.
The doctor says the previous overall was 6.1 and the HDL was 1.5 so ratio of 4.

Is it as simple as subtracting 1.5 from 5.9 or something more arcane?

ta.

It's more arcane. Although some of the values in the lipid test are calculated, you would need to know the value for HDL obtained by the test.

Jay