You Have Received Two Blood Samples,one in a Sodium Citrate

You have received two blood samples,one in a sodium citrate tube for coagulation studies and the other in an oxalate tube for glucose analysis from a patient diagnosed with diabetes mellitus.This patient's physician contacts you to request that lipid and lipoprotein analyses be added to the previous studies.What would be the best blood specimen for lipoprotein analyses and why?

A) The submitted specimens (citrate and oxalate) would be the most appropriate to use for lipoprotein analysis.
B) Ethylenediaminetetraacetic acid (EDTA) anticoagulant would be best because it inhibits the oxidation of lipids.
C) A special yellow-top tube must be used for lipoprotein analysis because it contains a special anticoagulant that maintains the integrity of the lipoproteins.
D) Serum would be best because it has no osmotic effects on cells and current cut points are based on serum values.