Which sample type is best for electrolyte analysis (such as blood calcium)?

Question

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Serum or heparinized plasma are the best choices for electrolyte analysis as they prevent clotting, which can interfere with the accuracy of the results. Both serum and heparinized plasma can be used for measuring blood calcium levels. EDTA plasma (option A) is not suitable for calcium analysis as EDTA chelates calcium ions, resulting in falsely low values. Oxalated plasma (option D) is used for measuring glucose levels and is not suitable for electrolyte analysis.

Which Sample Type Is Best for Electrolyte Analysis (Such as Blood