Which One of the Following Statements Concerning Electrolytes and Electrolyte

Which one of the following statements concerning electrolytes and electrolyte measurement is incorrect?

A) Routine laboratory analysis of electrolytes includes measurement of sodium,potassium,chloride,and bicarbonate as total carbon dioxide.
B) Ion-selective electrode measurements are based on the measurement of the potential difference between the ISE and the reference electrode.
C) Whole blood specimens should be stored at 4° C before separation.
D) Specimen requirements for electrolyte analysis include use of unhemolyzed serum or plasma.