I need to perform a blood draw from a patient and we are interested in keeping intact the VLDL present in the sample, because we want to do further analysis to them!... which would be the best collection tubes for this? which would affect the less to the lipoproteins? EDTA, heparin, Acid-citrate-dextrose tubes? or non of them would harm or affect the VLDL molecules?

Thanks in adavance!