I don’t think you should try to game your blood test. You should do the test with as normal current behavior as possible then understand the results and adjust as appropriate. Think of the blood test as a spot check.
When I did ADF my blood tests went haywire.
I clearly was releasing cortisol and my cholesterol went through the roof. Normal around 270 - was up to 420. My LDL was 310. My HSCRP was 6.0. Normally 1.8.
Your body can take such fasting to be “starvation” and that sends it into alarm.
I would eat normally for at least 3 weeks before the tests.
Triglycerides often go up when fasting (obviously more stored fat is released into blood stream) and when doing keto, but this in itself is not a decisive factor. As more fat is released into the blood there are changes of course and the levels can’t be the same. Increase in LDL is to be expected, but what matters is the size of the LDL molecules and the ratio of triglycerides to HDL.