A patient's serum sample was placed on the chemistry analyzer and the output indicated “out of range” for the measurement of creatine kinase (CK) enzyme. A dilution of the patient serum was required. Which of the following should be used to prepare a dilution of patient serum?
a. Deionized water
b. Tap water
c. Another patient's serum with confirmed, low levels of CK
d. Type III water
e. Type I water
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